Clans

Dailey, Daily, Daley, Dally, Dawley, O’ Daly, Ó Dálaigh.  The name Daly comes from the Gaelic word “Dálach”, which means ‘one who is present at assemblies’. This...

Mac Isog, MacIosog.   The name Cusack is originally derived from a place in Guienne in France and was first Anglicised as de Cussac, it was introduced into Ireland following the Norman invasion of 1172. Nowadays the name is common in Meath,...

Coningham, Conyngham, Counihan, Cunnigan, Ó Cuinneagáin.   Cuinneagán comes from the Scots’ Gaelic word “Cuinneag” which means ‘milk-pail’, and was brought to Ireland by...

This name may be of Gaelic or Norman origin. In Gaelic, Ó Cuillin comes from the word “Cuileann” meaning ‘holly-tree’. The name originated in south-east Leinster, and remains strong there until this day. The Norman name can...

O' Crowley, O' Cruadhlaoich.   The sept of O’ Crowley began as an offshoot of the McDermott’s in County Roscommon. Branches settled in Dunmanway in County Cork – and are still much identified with that area. Another small...

O' Cróinin, Cronin.   The name Cronin is from a diminutive cron meaning ‘swarthy’ or ‘yellow’. The origin of this family name lies in Cork, particularly the West of the County, where place names such as Cooscronin...

Coghlan, Cohalan, MacCochláin, MacCoughlan, O' Cochláin.   The two main septs of the name Coughlan are to be found as MacCoughlan in County Offaly and O’ Coughlan of County Cork. Both names are derived from...

 Casserly, Costelloe, Mac Coistealbh, Mac Costello, Nangle.   The Costello name, and its variations, are of Anglo Norman origins, and have an interesting history. The original name of the clan was deAngulo, or Nangle, and...

Conboy, Conomy, Convey, Mac Conomy, Mac Conway, O’ Conway, Ó Connmhaigh.   The Conway clan name, and its variations, have both Irish and Welsh origins. The Welsh bearers of the name originated in the town...

Connally, O’ Connally, O’ Connolly, Ó Conghaile.  The Connolly name originated in the province of Connacht in the west, and also in Co. Monaghan in the north, but has since been widely dispersed throughout the...

Cullane, O’ Cullane, Ó Coileáin.   The Collins name is common throughout counties Cork and Limerick, and in the province of Munster in general. The name means ‘a young creature’, from the Gaelic...

Clark, Cléireach.   Clarke, or Ó Cléirigh in Gaelic, is a very popular surname in Ireland. It is found predominantly in the northern province of Ulster. Its meaning originates in the Gaelic word...

Mac Casey, O’ Casey, Ó Cathasaigh.   Ó Cathasaigh comes from “Cathasach”, meaning ‘vigilant in war’. There were several distinct septs of Ó Cathasaigh; in Dublin, Limerick, Cork, Mayo...

Carvill, Mac Carroll, Mac Carvill, O’ Carroll, Ó Cearbhaill.   Historically, there were several septs of Ó Cearbhaill located in counties Offaly and Louth. The name comes from the Gaelic...

Cary, Carye, Keary, Keery, O’ Keary, Ó Ciardha.   Careys can be of Anglo-Norman or Irish origin. The Irish Careys are descended from the Ó Ciardha sept which was located in the Barony of Carbury in Co...

Cathal, MacCathail.   Mac Cathail comes from the personal name Cathal. Cahill is one of the oldest recorded surnames in Ireland. There were several different clans of the name, located in Kerry, Galway, Tipperary and Clare. The Galway sept of...

Byrnes, O’ Beirne, O’ Byrne, Ó Broin.   Byrne, Ó Broin in Gaelic, is now one of the most numerous names in Ireland. The name comes from the word “bran”, which is Gaelic for ‘raven’...

Bourke, De Búrca, De Burgh   De Búrca was originally de Burgo, and is the most common Irish name of Norman origin. The Burke name is most often associated with the province of Connacht where the family was granted large...

Bohilly, Boughill, Boughla, O’ Buhilly, Ó Buachalla.   Ó Buachalla comes form the Gaelic word “buachaill”, meaning ‘boy’ or ‘herdsman’. Originally, the name was to be...

Branny, Mac Brennan, O’ Brennan, Ó Braonáin.   There were four septs of the Ó Braonáin clan in the country, located in Kilkenny, Galway, Westmeath and Kerry. There was also a sept of Mac...