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Surname Registry
last updated 16 November 2016
C
| Surname | Ireland Location | Where Emigrated | Timeline | Contact |
| Caddell | Portadown | Taunton, MA | 1867 | |
| Cafferty | Co Mayo | Scranton PA | mid 1800s | |
| Caffrey | Cavan | Queensland, AU | 1840-1870 | |
| Cahill | Adrahan/Gort Galway | Queensland AU | 1856 | |
| Cahir | Ennistymon, Co Clare | Rhode Island | 1860> | |
| Cain | Unknown | New South Wales, AU | 1815 | |
| Cairns | poss Cork | Dundas Village, ONT, CAN | ca 1846 | |
| Cairns | Belfast | Kingston,ONT,CAN | 1875-1877 | |
| Calhoun, Colquhoun | Newton-Stewart, Co Tyrone | Lancaster Co, PA, USA | not given | |
| Callaghan | Gurteen, Sligo | So Dakote, OH | 1860-1930 | |
| Callahan | Cork | New Haven CT | 1800-1926 | |
| Callahan, etc. | prob. Cork | WI > MN, USA | 1840s - 1900s | |
| Callahan | Cork | Ireland | 1800s | |
| Calla(g)han | Cobh & Aghada, Co Cork | Poplar, London UK, poss PA | 1825-1881 | |
| Callan | Ardarver,Terramonghan, now Tyrone | not given | 1850 | |
| Callan | Co Donegal | USA | 1870-1914 | |
| Callan | Co Galway | NYC, NY | 1850-1860 | |
| Callender | Dublin | Philadelphia, PA | 1820> | |
| Callery/Callily | Mayo | not sure | 1858-1890 | |
| Calhoun | Co Tyrone | Simcoe, ONT, CAN | 1705-2008 | |
| Callinan/Callanan | Offaly | Australia | 1830s | |
| Callivan | Galway | VA, USA | 1774 | |
| Calvin/Colvin | Cos Monaghan & Tyrone | CAN, AU, USA, ENG | 1750-2000 | |
| Calnan | unknown, Cork | England | not given | |
| Camey | Portaferry, Co Down | USA, Illinois | 1700-1869 | |
| Campbell | Donegal, Kilmacrennan, Killybegs Lower, Glenties | PA | 1883 | |
| Campbell | Ardboe, Co Tyrone | Warwick, Qld, Australia | 1864 | |
| Campbell | Co. Armagh, Derrylard | Troy NY | mid 1800s | |
| Campbell | Malin, Co Donegal | Chicago, IL | 1833-1916 | |
| Campbell | Tyrone | Philly, PA | abt 1850 | |
| Campbell | Ballycarry Co Antrim | Philadelphia, PA; BC, CAN | 1820> | |
| Campbell | Ballinderry Parish, CoAntrim | FayetteCo, TN | 1812 | |
| Campbell | Lislea, nr Kilrea, Co Derry | Prescott, ONT, CAN | 1847 | |
| Campbell | Malin, Co Donegal | Chicago, ILL | abt 1855 | |
| Campbell | Galway | Australia | 1783-1854 | |
| Cameron | Ballymena Irelandmagee Broughshane | Australia | 1790-1870s | |
| Canalley | Antrim | Philadelphia PA | 1864 | |
| Canavan | Co Cork | Montreal, CAN, NY, USA | 1842 | |
| Cannon | Ardbane, Co Donegal | PA, USA | Abt 1820 | |
| Cannon | Galway | LA | early 1800s | |
| Canny | Capakea,O'Briensbridge,CoClare | Melbourne, VIC, AU | 1852 | |
| Canny | Clare | not given | All | |
| Canny | Clonmoney, Ballycasey, Co Clare | AU | ca 1880 | |
| Cantlon | Co Kerry | Guelph, Ontario CAN | 1801-1950 | |
| Cantley | Down, Dublin | ENG,SCOT,USA,NZ,S Africa | 1700-2008 | |
| Cantwell | Rahan, Co Offaly | IL > MA > NY | 1848-1930 | |
| Cantwell | Thurles, Co Tipperary | Elizabeth, NJ | 1875-1880 | |
| Cantwell | Castlecomer/Clogh, Co Kilkenny | Schuylkill Co, PA | 1848 | |
| Carberry/Cabrey | Belfast | Winnepeg, CAN | 1872-1908 | |
| Carew | Fethard | NY | 1851 | |
| Carey | Co. Dublin, Malahide | Philadelphia PA, USA | 1840-1880 | |
| Carey | Sligo | New York | 1852 | |
| Carey,Keary,Kearey | nr Roscrea, Co Tipperary | Niagara Co, NY | 1860s | |
| Cargo | Armagh, Co Down, Co Antrim | USA | 1700> | |
| Carlan | unknown | PA > OH | 1845-62 | |
| Carlin | Londonderry | BC,CAN & OZ,SCOT | 1840 | |
| Carmody | Cork | Liverpool ENG > NYC | 1889 | |
| Carmody | Dublin | Unknown | Unknown | |
| Carmody | Cappamore, Co Limerick | Did Not Emigrate | 1800s | |
| Carmody | unknown | Prince Edward Co, CAN | Bef 1825 | |
| Carmody | Tipperary | not given | 1820-1920 | |
| Carnew, Conu, Cornew | Co Cavan | IN, IA, SD | 1830-1930 | |
| Carney | Co Meath | Lawrence, Essex Co, MA | Bef 1859 | |
| Carolan | Nobber, Co. Meath | USA-NJ, IL | 1850 | |
| Carr | unknown | Westchester Co, NY | 1840-60 | |
| Carr | Galway & Dublin | Ont. CAN, St Louis, MI, Worcester, MA | 1883-1885 | |
| Carr | Sligo | Hartlepool, Co Durham, UK | 1870-1880 | |
| Carr | Connaught | England | 1826 | |
| Carrick | Clare | Australia | 1851-1860 | |
| Carrigan | Kilkenny | Cloustershire ENG > NE, USA | 1821-80 | |
| Carrol | Co Mayo | NY | 1887 | |
| Carroll | Ferbane, Co Offaly | NSW, AU | 1799-1828 | |
| Carroll | Offaly | Chicago IL, USA | 1930 | |
| Carroll | Hugginstown, Co Kilkenny | Frankford IL, Emmetsburg IA | 1850s-1885 | |
| Carroll | Co Limerick | Unknown | 1810-1900 | |
| Carroll | Monaghan | Buctouche, New Brunswick CAN | 1810-1820 | |
| Carroll | Dundalk | Liverpool | 1840-1851 | |
| Carroll | Kerrikyle, Limerick | MI | early 1800s | |
| Carrol/Carroll | Co Down | did not emig | 1775-1875 | |
| Carroll | Kerry | Phila. PA | 1800-1900 | |
| Carrol/Caroll | Co Monaghan | Seneca Co, NY | 1850-1860> | |
| Carroll | Derrys,Rahan, Co Offaly | Trenton, NJ | 1880-1953 | |
| Carse | Balloo, Killinchy, Co Down | Winnipeg, CAN | 1906 | |
| Carson | Co Down | Edwardsburgh, Grenville Co CAN; Jermyn PA | 1794-1890 | |
| Carson | Cos. Tyrone, Fermanagh & Down | CAN, USA, AU, NZ | 1720-1920 | |
| Carson | N Ireland | Belfast | 1700-1750 | |
| Carson | Antrim | North Carolina, USA | Abt. 1818 | |
| Carson | Galway | Australia | 1817-1853 | |
| Cartmill | Loughgall Co Armagh | New Zealand | 1830-1880 | |
| Cartwright | Galway | not given | 1788-1824 | |
| Carty | #1 Fort Eyre, Galway | USA | 1896-1953 | |
| Carty | WExford | not given | not given | |
| Carville | Co Armagh | CAN, USA | 1870-1890 | |
| Casey | Belmullet, Co Mayo | Chicago, IL | 1870s-1890s | |
| Casey | Lissonuffy, Granahan Martin, Co Roscommon | NY, Detroit MI | 1921 | |
| Casey | Fethard Co Tipperary | New York | 1907 | |
| Casey | Bantry, Cork | Northern NY | 1850 | |
| Casey | North Co Mayo | Colorado USA | 1850s-on | |
| Casey | Beara | not given | not given | |
| Casey | Unknown | Mansfield, Richland Co, OH | 1840-? | |
| Casey | Shanballysallagh, Tubber, Co.Clare | AUS, USA, UK, S.Africa | 1824-1918 | |
| Casey | Co Galway | IA, NY; Biddulph, ONT, CAN | 1840-1872 | |
| Cashman | Cork | Chester Co, PA | 1870 | |
| Cashman | Ireland | Rochester, Monroe, NY | 1850s | |
| Cashman | Co Cork? | Trinity Bay, Newfoundland | Late 1700s | |
| Cashman | Co Cork | Troy NY | 1854 | |
| Casserley | unknown | Sheffield ENG | 1869-1940 | |
| Cassidy | unknown | Genesse Co, NYS | 1840s | |
| Cassidy | Co Monaghan | Govan, Glasgow, SCOT | ca 1850 | |
| Cassidy | Cullybackey, Co Antrim | Philadelphia, PA | 1830> | |
| Cassidy | Donaghmoyne, Monaghan | Hartford CT > NY, NY | 1882 | |
| Cassidy | Derrylin, Fermanagh | Co Armagh?>Boston, MA | 1865-1883 | |
| Cassidy | Cummor | Philadelphia, PA | 1893 | |
| Cassidy | unknown, south? | Manhattan, NYC, NY | 1846 | |
| Casler | Co Armagh | Virginia | 1846-56 | |
| Cathcart | Fermanagh | Lancashire, ENG | 1860-1870 | |
| Cathers | Tyrone | Brooklyn, NY | 1853 | |
| Caughey | Ballynahinch, Co Down | NY | 1887-1987 | |
| Cauley | Belmullet | Newcastle-upon-Tyne | 1908? | |
| Caulfield | unknown | Maine, California | 1840-1850 | |
| Cavanagh | Dublin | New Zealand | 1860s | |
| Cavana(u)gh, Kavanagh | Co Mayo | Scranton PA | mid 1800s | |
| Cavanaugh | Kilkenny | OH | 1850-1856 | |
| Cavanaugh | Guardhill, Killivan, Co Monaghan | western PA | 1800-1960 | |
| Caven(n)ey | Roscommon | USA | 1840s | |
| Cavey | unknown | USA>Baltimore & Howard Cos., MD | 1700-1780 | |
| Cawley | Ballysakerry Mayo | NY, PA | 1847 | |
| Chambers | Tyrone | NY | 1860-1920 | |
| Chambers | Tullylish, Banbridge, Co Down | not given | 1799-1945 | |
| Chambers | Ballyduff & Ardmore, Co Waterford | Boston & W Maryland | 1846 | |
| Chambers | Belfast, Co Down | Montreal Quebec | 1850> | |
| Chandler | Tipperary & poss. Dublin | Williamstown, PA | 1873 | |
| Charles | Co Leitrim, Carrigallen | NYC | 1867 | |
| Chester | Dublin | NY | 1800-1950s | |
| Chestnut | Craig Park, Co Antrim | Philadelphia, PA | 1851 | |
| Christopher | Knockane, Co Waterford | Yonkers, NY | 1892 | |
| Churchill | Co Tipperary | Canada | bef 1845 | |
| Clabby/Claby | Unknown | Baltimore, MD | 1854 | |
| Clancy | Loghill, Limerick | Melbourne AU | 1861-3 | |
| Clancy | Killshandra, Belturbet, Co Cavan | Tasmania, AU | bef 1849 | |
| Clancy/Glancy | Kilkenny | Gorbals, Govan, Glasgow | 1800's | |
| Clancy | Co Kilkenny | Halifax, NS, CAN | 1850s | |
| Clancy | Ballynoe, Co Cork | Unknown | 1830-1850 | |
| Clancy | Waterford | Jo Davies Co, IL | 1856 | |
| Clare/Clair | Rathdrum, Co Wicklow | Cayuga >Rochester, NY | not given | |
| Clark | poss Armagh | Ontario CAN | 1833 | |
| Clarke | Co Cavan | not given | 1830+ | |
| Clarke | Hillsborough, Lisburn, Belfast | Thames, New Zealand | 1820-1880 | |
| Clarke | unknown | England | 1850s | |
| Clarke | Kilmore, Co Wexford | Cleveland, OH | 1870 | |
| Clarke | Co Longford | Buffalo, NY, Jersey City,NJ | 1890s | |
| Clarke | Donegal | IL > CA | 1838-1840s | |
| Clark(e) | Derrylin, Co Fermanagh | NY, IL | 1820-1900 | |
| Clark(e) | Kiltimagh, Mayo | St Louis | 1820> | |
| Clark(e) | Tullamore | Perth, Ontario | 1821-22 | |
| Claven/Clavin | Westmeath | Wales | 1835-1840 | |
| Clayton | Cloyne, Co Cork | London, ENG | 1830-1901 | |
| Clear, Claer | Wexford | Canada | 1847 | |
| Cleary | Sligo | Buffalo NY | 1890-1900 | |
| Cleary | Co Cork, Clonakilty area | Australia | 1887 | |
| Cleary | Kildare | New South Wales, AU | 1842 | |
| Cleary | Blackstone, Co Wexford | Cleveland, OH | 1870-1880 | |
| Clegg | Co Dublin-Co.Down | Georgia, USA | 1955 | |
| Clements | Derry | NJ | mid 1860s | |
| Clerehan | Co Tipperary | Melbourne | 1830 onward | |
| Clerkin | poss. Cork | Botetourt Co, VA | abt 1847 | |
| Clifford | Limerick | New Zealand | 1859-1902 | |
| Cline | Ulster | unknown | 1850-present | |
| Cloherty | Galway | Australia | not given | |
| Close | N Ireland | not given | 1820-1902 | |
| Coakley | Garravasoge, Ballintober, Cork | did not emigrate | 1870-1920 | |
| Coates/Coats | Kiltormer & Lawrencetown, Galway | Vigo Co, Indiana | 1815-1856 | |
| Coates | Celbridge, Kildare | New York, NY | 1840s | |
| Cochran(e) | Omagh, Co Tyrone | St.Johns,NB,CAN | 1830 | |
| Cody | Co Kilkenny | Prince Edward Island CAN | ca 1830 | |
| Cody | Earlsgrove, Thomastown, Co Kilkenny | Sydney, NSW | 1829-1905 | |
| Coen | Roscommon | NYC, NY | 1920-1928 | |
| Coffey | Castlepollard, Co Westmeath | NYC, NY | 1880-1925 | |
| Coffey/Coffee | Liscannor, Co Clare | N/A | 1700-1860 | |
| Cogan | Sligo | Davenport, IA | 1860 | |
| Cogan/Coogan | Roscommon or Cork | Detroit, MI | 1863-1883 | |
| Coghlan | Skibereeen Co Cork | Dublin | 1972 | |
| Colbert | Cork | Washington DC > Baltimore MD | 1865-1920 | |
| Colbert | Possibly Waterford | New York | 1843 | |
| Colbourne | Co. Wexford | CAN & USA | 1800-1860 | |
| Colcroft/Calcroft | not given | New York, NY | 1871 | |
| Cole | Richhill, Co Armagh | Cape Colony, SA | 1839-1865 | |
| Coleman | Cork | New York, NY | 1830-85 | |
| Colgams | Straide, Kiltamagh, Balla, Bohola, CoMayo | Wales,USA | 1890+ | |
| Colgan | Omagh Co Tyrone | N/A | 1835- | |
| Colgan | Islandmoyle, Co Down | USA or England | 1800s | |
| Colman | Muckno, Monghan, Ulster | Scotland > PA, USA | 1827 onward | |
| Coolahan | Galway Ballinasloe | Galway | 1835 | |
| Coolican | Mayo | Dunmore PA | 1860s | |
| Coll | Creaghadoos, Donegal | NZ, AU, USA | 1750-1900s | |
| Colleary | Killavil, Ballymote Co Sligo | NYC | 1880-1895 | |
| Collier | Myshall, Carlow Co | Ohio | 1866 | |
| Collins | poss Cork, unknown | USA | 1867+ | |
| Collins | Co Mayo | Boston MA | 1883-4 | |
| Collins | unknown | Canada > IL, USA | 1840s | |
| Collins | Co Roscommon | Philadelphia, PA | 1893 | |
| Collins | Unknown | Mooers, NY, USA | 1848-1856 | |
| Collins | Schull, Co Cork | Buffalo, NY | 1846 | |
| Collins | Limerick & Cork | not given | 1875 | |
| Collins | Clare | NY, IL, MN | 1848 | |
| Collins | Kerry | NY>PA>MN | 1850-1851 | |
| Collins | unknown | OH | 1859+ | |
| Colohan | Galway | did not emig | not given | |
| Colohan/Coolahan | Ganaveen/Ballynamangh/Ballinsloe | CAN | 1870-1885 | |
| Colville | Co Armagh | PA & VA | 1740-1770 | |
| Colville | Islandmagee, Co Antrim | Australia | 1884 | |
| Colvin | Inver, Donegal | Brooklyn, NY | 1860-1865 | |
| Comerford | Wexford, Kilkenny | NYC, NY | 1882 | |
| Comerford | Mooncoin | Boatmans Reefton, NZ | Bef 1868 | |
| Conboy | Roscommon | New Zealand | 1850s | |
| Condon | Clare | not given | 1835 | |
| Condren | Anywhere | not given | Any | |
| Condron | Offaly | not given | not given | |
| Condron | Maryborough, Co Laois | USA | 1825-30 | |
| Conlon | Ballina area, Co. Mayo | Philadelphia, PA | 1855 | |
| Conlon | Co Sligo | Susquehanna Co,PA | 1847-1900 | |
| Conley, Connelly, Connolly | Clifden, Co Galway | England > SCOT > USA | 1870-80 | |
| Connaughton | Galway | Boston, MA | 1880-1914 | |
| Connare | Carrabane, Co Galway | Pittsburgh PA | 1873+ | |
| Connair (all sp) | Galway | United States | 1875-1910 | |
| Conneely | Dolan, Bunowen, Galway | not given | not given | |
| Connell | Meath | New Jersey | 1904 | |
| Connell | Co Cork | Canada | 1820s-1830s | |
| Connell | Co Roscommon | Philadelphia, PA | 1894 | |
| Connell | Ballingarry, Co Tipperary | Did not emigrate | 1830-1880 | |
| Connell | Ballinhassig,Co Cork | AU | 1820-1836 | |
| Connellan | Kilmaley, Co Clare | Victoria, Austalia | 1830> | |
| Connelly | Dunmore, Co Galway | Stamford, Conn. | Abt 1906 | |
| Connely | not given | not given | not given | |
| Connole | Ennistimon | Leeds, ENG | 1870s | |
| Connolly | Sligo | did not emig | not given | |
| Connolly | Skibbereen, Co Cork | unknown | unknown | |
| Connolly | Kilcarry Bagnalstown, Co Carlow | Australia | 1871 | |
| Connolly | not given | New Jersey | 1840-1850 | |
| Connor | North Co. Cork | Pittsburgh PA, USA | ca 1850 | |
| Connor | Roscommon | not given | 1800s | |
| Connor | Kilfarboy, Co Clare | Durham City, ENG | 1850 | |
| Connor | Roscommon | New South Wales, AU | 1885 | |
| Connor | Ahoghill Co Antrim? | ONT, CAN | 1830s | |
| Connor | Ahoghill, Co Antrim | ONT, CAN | Bef 1840 | |
| Connors | Co Laois | not given | 1830s | |
| Connors | Co Kerry | So Amboy NJ | 1864 | |
| Connors | unknown | Gardner, Groton MA | not given | |
| Connors, Conners | Cork | Warren Co, NY; Iowa | 1830-55 | |
| Cooke | Co Clare, Co Cork | ONT, CAN | 1836-1840 | |
| Cooney | Kilmichael, Co Wexford | Merthyr Tydfil,Wales/Pittsburgh,PA | 1809+ | |
| Cooney | Achill Island, Co Mayo | Cleveland, OH | 1864 | |
| Conrahy | Offaly | Did Not Emigrate | 1882-1889 | |
| Conroy | Co Laois | Southern IN, USA | 1850s | |
| Conway | Belfast, Co Antrim | not given | 1907-1910 | |
| Conway | Newport, Mayo | UK, USA | 1815-1915 | |
| Cooke | Cavan, Kilkenny, Antrim | Brockville Elizabethtown, ONT, CAN | 1826-1830 | |
| Copeland | Co Cork or Co Waterford | Prince Edward Is, NB, CAN | 1846-1840 | |
| Corbet(t) | Cloyne, Co Cork | England & AU | Abt 1800 | |
| Corbett | Turkstown, Fiddown C. Par, Co. Kilkenny | Tauton, MA & St Johnsbury,VT | 1851-1900 | |
| Corbett | Kilfarboy, Co Clare | Durham City, ENG | 1850 | |
| Corbett | Loughea, Killaloe, Co Clare | NSW, AU | <1861 | |
| Corcoran | Co Roscommon, Crossna | Shiawassee Co, MI, USA | 1852 | |
| Corish | Wexford | Prince Edward Co, CAN | 1810-1819 | |
| Corrigan | Keady | Scotland | 1845-1920 | |
| Costello | Kilkerrin, Glenamaddy, Co Galway | New York | 1920s | |
| Costello | Borrisoleigh, CoTipperary | Troy, NY | 1892 | |
| Costello | Moneymore, Co Derry | unknown | 1800s | |
| Costello | Galway | Boston | 1900-1919 | |
| Costello/Costella | unknown | Northumberland, ONT,CAN | 1800-1850 | |
| Costigan | Offaly | Philadelphia | 1850 | |
| Costley | unknown | Northumberland, ONT,CAN | 1800-1850 | |
| Costin | Waterford | Chicago IL | 1850-5 | |
| Cotter | Cork, Munster | QLD, AUST | 1880+ | |
| Cotter | Inchigeelagh Par, Co Cork | did not emig | ca 1835 | |
| Cotter | Co. Cork | Ontario CAN | 1830-1890 | |
| Cottingham | Co Mayo | Steubenville,OH, USA | 1850-1870 | |
| Cottle | unknown | St Louis MO | 1845-1924 | |
| Couch | Cork City (Southside) | ENG | 1800-2008 | |
| Coughlin | Co Laois | MA, USA | 1841 | |
| Coulter | Fermanagh | PA, MO, USA | 1847 | |
| Coulter | Down | PA | 1700-1790 | |
| Coulter | Northern Ireland | CAN, > Sacramento, CA | 1861-1880s | |
| Coulter | Drumquin, Tyrone | not given | 1800-1855 | |
| County | Stradavoher, Tutles, Co Tipperary | Australia | 1859 > | |
| Course/Coursey | Roundstone, Co Galway | Ontario, CAN | 1880 | |
| Courtney | Killead Parish, Co Armagh | NZ; CAN; USA | 1800-1910 | |
| Courtney | Ballymoney | not given | 1858 | |
| Cove | Kilkenny, Co Kilkenny | New York | 1866 | |
| Cowhig | Ballynoe, Co Cork | Unknown | 1830-1850 | |
| Cowan | Galway | not given | not given | |
| Cowan | not given | Canada | 1812-1840 | |
| Cowan | Tyrone, Fermanagh | S AU | 1852 | |
| Cox | Enniskillen, Co Fermanagh | CAN | Abt 1833 | |
| Cox | Enniskillen, Co Fermanagh | Goderich, Ontario | 1832-33 | |
| Coy | Kilchreest, Loughrea, Co Galway | not given | not given | |
| Coyle | Monaghan, Cavan | Scotland | 1700s | |
| Coyle | not given | Philadelphia, PA | 1872 | |
| Coyne | Inis Mor | Portland ME | not given | |
| Coyne | Clonbur, Co Galway | Pittsburgh PA, USA | 1900 | |
| Coyne | Co Mayo | Cincinnati, OH | 1849 | |
| Coyne | Co Roscommon | Jersey City, NJ | 1880 | |
| Coyne | Dublin | USA, NY? | 1888-1920 | |
| Crabtree | Kilcullen, Co Kildare | Australia | 1700-1850 | |
| Craddick, Craddock | Moyne Par., Co Tipperary | NY, USA | 1848-1861 | |
| Cragin (Cragen?) | Dublin | Maine | 1850s | |
| Craig | Antrim, Ahoghil, NI | Laurens Co, SC | 1770s | |
| Craig | Roscommon | Widnes, Lancashire | 1855-1880 | |
| Cranston | Tyrone, Monaghan | Ohio, USA | 1664-1802 | |
| Crawford | Co Donegal | NYC, NY; LaSalle County, IL | 1849> | |
| Crawley | Co Armagh | AU | 1848 | |
| Crawley | Co Louth | Glascow, Scotland | 1780-1860 | |
| Crean | Camp, Co Kerry | Connecticut | 1898 | |
| Creed | Cork | Bridgeport, CT | 1865-1923 | |
| Cregan | Newcastle West, Co. Limerick | CAN-Utica, NY | 1848-1900 | |
| Crehan/Crane | Galway | Hingham, MA | 1833 | |
| Crilly | Dundalk, Co Louth | not given | not given | |
| Crinnion | Louth | Liverpool>Phila.>St Louis | 1800> | |
| Crockett/Crocktagne | Donega | not given | 1643-1735 | |
| Croke | Unknown | Newfoundland | 1800-1860 | |
| Croker | Poss. Limerick or Cork | NewBrunswick>Quebec>WI | 1836-1849 | |
| Cronan | Co Tipperary | Mooers, NY | 1840s | |
| Cronin | Kilfinane, Co Limerick | NY | 1910 | |
| Cronin | Killorglin, Co Kerry | Hartford, CT | c 1883 | |
| Cronin | Kerry | Boston, MA, USA | 1890s | |
| Cronin | Unknown | W Springfield, MA | 1800s | |
| Cronin | Co Meath | NY | 1874 | |
| Cronin | Clare | not given | 1875 | |
| Cronin | Kiskeam, Co Cork | South Wales | 1890 | |
| Cronin | Duagh, Co Kerry | PA, USA | 1870-1920 | |
| Crossan | Carrydarragh, Derry | Edinburgh, SCOT, > Rockhampton, Qld, AU | 1880s> 1888 | |
| Crossle | Co Tyrone | Simcoe, ONT, CAN | 1792-1879 | |
| Crowcock | Co Meath | did not emig | 1872-1927 | |
| Crowdle | Kilkenny, Tipperary, Waterford, Wexford | England, USA | 1800-2008 | |
| Crowe | Ireland | not given | 1815+ | |
| Crowe | Emly, Co Tipperary | Saratoga>Troy, NY | Ca 1848 | |
| Crowe | Emly, Co Tipperary | Melbourne, AU | 1800s | |
| Crowley | Co. Cork | Holliston MA | 1850 on | |
| Crowley | Derry City | Illinois | 1909 | |
| Crowley | Cork, Bantry & Dunmanway | Philadelphia PA | 1860-1920 | |
| Crowley | Co. Cork | CT | early 1800s | |
| Crowley | Crowley | Brooklyn, Bristol, & Rochester, NY | 1850s | |
| Cruise | Meath Hill, Co Meath | Newark, NJ | not given | |
| Cruise | not given | not given | not given | |
| Cruise | Belfast | CAN, NZ | 1920-1927 | |
| Cryan | Frenchlawn, Roscommon | Kalamazoo, Michigan | 1870s | |
| Cuddy | Kilkenny, Laois | Sellersburgh IN, USA | 1830-70 | |
| Cuggeran | Cloonsnaghta& Boultidoolan,Co Clare | NJ& NY>IA | 1857-1882+ | |
| Culbertson | Gartfadd, Stranorlar, Leatbegg | USA | 1812-1813 | |
| Culhane | Kerry, Limerick | New York | mid 1800s | |
| Culhane | Limerick | Australia | 1824+ | |
| Cullen | Sligo | NY | 1870 | |
| Cullen | Unknown | Jersey City NJ | 1868-1880 | |
| Cullen | Kilmactranny, Co Sligo | Bathurst, Australia | 1838-1851 | |
| Culligan | OldCastle, Co Meath | New York, USA | 1900s | |
| Cullinan | Co Cork | MA | 1869 | |
| Cullinan | Co. Galway, Gortavoher | New Rochelle NY | 1920s | |
| Cullinane | Loughrea, Galway | NY | 1830-1940 | |
| Culloden | Dublin | not given | not given | |
| Cummings/Cummins | Kilkenny, Castlecomer, Clogh | Richmond,MA,SchuykillCo,PA | 1840-1850 | |
| Cummings | Timahoe, Queens Co | Philadelphia, PA | 1840-1880 | |
| Cummins | Tipperary | Wales | 1850-1860 | |
| Cunnea | Co Donegal | not given | not given | |
| Cunniffe | Galway | England | 1886 | |
| Cunningham | Clare | Washington DC | pre 1863 | |
| Cunningham | Fethard, Cashel, Kockbritt, Co Tipp & Mitchellstown, Galbally, Kilmallock, Co Lim | not given | not given | |
| Cunningham | Co Donegal | Carbon Co, PA | 1860s | |
| Cunningham | Belfast, Antrim | Australia | 1855 | |
| Cunny/Quinn | linformation under Quinn | not given | not given | Ed |
| Curley | Galway, Tuam area | Galway > Canada | 1827-1850 | |
| Curran | Co Louth | Genesee Co., NY | 1846 | |
| Curran | Galway, Spiddal | Boston MA | 1900-13 | |
| Curran | Castlecomer, Clogh, Co Kilkenny | Schuylkill Co, PA, USA | 1845-48 | |
| Curran | Galway | did not emig | not given | |
| Curran | Co Kerry | Boston MA | 1913-1940 | |
| Curran | Co Longford | Maunch Chunk, PA | not given | |
| Curran | Co Waterford | Yonkers, NY | 1849? | |
| Curran | Co Down, nr Bainbridge | Manchester, ENG; OH & PA, USA; Kaipoi, NZ | 1790 to now | |
| Curran | Barna, Co Galway | New York City, NY | 1870 | |
| Curreen | Co Waterford, Ardmore | not given | 1800-1900 | |
| Curreen | Ireland | New Zealand | 1859-1894 | |
| Currie | Limerick | New Zealand | 1888-1958 | |
| Currough, Crough | Co Down | unknown | 1832-1938 | |
| Curtis | Ardee, Co Louth | New York | 1989 | |
| Curtis | Cork | IL | 1818 | |
| Cusack/Cusick | Co Mayo | PA, USA | 1873 | |
| Cusack | Co Cavan | Baltimore,Catonsville, MD | 1870s-1880s | |
| Cusick | Co Clare | not given | 1850s | |
| Cusick | Galway | Massachusetts | 1833 | |
| Cusick | Unknown | Logansport, IN | 1860 | |
| Cusick/Cusack | unknown | PA, MD, MO | 1859 | |
| Cussen | Cork | QLD, AUST | 1850+ |
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