Alphabetical List of Irish Names: C
Irish Surnames | A-B | C | D | E-G | H-J | K-L | Mac | M-N | O | P-R | S-W
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| Name | Variants | In Irish | Location | Origin | Comments |
|---|---|---|---|---|---|
| Cahill | MacCathail | Clare, Galway, Tipperary | Gaelic | Cathal is one Irish equivalent of Charles. | |
| Campion | Kilkenny, Laois | Norman-French | From "de Champagnes" | ||
| Carey | O'Kerry, Kerry, Carew | Ó Ciardha | Kerry, Kildare | Gaelic | |
| Carroll | Carville, MacCarvill | Ó Cearbhaill | Gaelic | ||
| Cassidy | Ó Caiside | Widespread, Fermanagh, Donegal | Gaelic | ||
| Clancy | Clanchy, Glanchy, MacClancy | MacFhlannchaidh | Clare, Leitrim | Gaelic | |
| Clarke | O'Clery, Macalary, MacClery | Ó Cleireach | Ulster | Gaelic and English | Son of the Clerk. In some cases Clarke is an Anglicised version of Clery but some have ancestors from England, where the name has the same derivation. |
| Clery | Cleary, Clarke | Ó Cleirigh | Connaught | Gaelic | Cléireach is the Irish for "clerk". |
| Cody | MacÓda | Kilkenny, Wexford | Norman-French | ||
| Coghlan | Coughlin, O'Coughlan, Coughlan, Cohalan, MacCoughlan. . | Ó Cochlain | Cork, Offaly | Gaelic | Means "cape or hood" in Irish. |
| Collins | Ó Cioleáin | Widespread, West Cork | Gaelic | Cioleáin means "young creature" or pup. | |
| Conaghan | Cunningham | Ó Connacháin | Ulster | Gaelic | |
| Connolly | Connely, Connolley | Ó Conghaile | Widespread. Galway, Mayo, Cork, Monaghan | Gaelic | Means "valorous". An very old Connaught family |
| Conroy | O'Mulconry, Mulconry, Conary, Conree, Conry | Ó Conratha | Clare, Roscommon, Longford | Gaelic | Means "hound of prosperity" |
| Conway | O'Conway | MacConnmhaigh | Clare, Kerry, County Dublin. | Gaelic | Means "hound of the plains". |
| Cooney | Conan, Coonan, O'Cuana, Counihan | Ó Cuanaic | Clare, Galway, West Cork | Gaelic | Means "handsome". |
| Corcoran | O'Corcoran | Ó Corcrain | Fermanagh, Kerry, Mayo, Offaly | Gaelic | Means "ruddy". |
| Costello | Nangle, Costelloe | Widespread, Galway, Mayo, Sligo | Norman | From MacOisdealbh "son of Oistealb", but originally from the Norman name "de Nangles" | |
| Crowley | Crawley | Ó Cruadhlaoich | Cork, Roscommon | Anglo-Norman | Means "strong hero". |
| Cullen | Cullion, Culhoun, MacCullen, Cullinane | Ó Cuillin | Kildare, Wexford | Gaelic | Means "holly tree". |
| Cummins | Commons, Comyns, Hurley | Ó Comáin | Kerry, Limerick, Mayo | Gaelic | Comáin means "hurley". . |
| Curran | Ó Corráin | Galway, Kerry, Waterford | |||
| Curtin | MacCuirtin, MacCruitin, MacCurtin, Curtayne | Ó Cuirtin | Cork, Dublin, Limerick | Gaelic | Derived from Cruitín maning "hunchback". |
| Cusack | Ó Cíomhsóg, MacIosóg | Kildare, Meath, Mayo | Anglo-Norman |
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