O'Callaghan
“descendant of Ceallachán of Cashel”
The sept's historic heartland, highlighted. People moved — a name can be found far from home.
Is O'Callaghan an Irish name?
O'Callaghan is a Gaelic name: it was formed in Irish, from an Irish ancestor, before English was spoken here. In Irish the name is Ó Ceallacháin.
What does the surname O'Callaghan mean?
O'Callaghan (Irish: Ó Ceallacháin) means “descendant of Ceallachán of Cashel”. Origin: Gaelic sept.
Where in Ireland is the surname O'Callaghan from?
The historic homeland of the O'Callaghan name is Cork, Clare. People moved, so the name can be found far beyond it.
What is the Irish for O'Callaghan?
Ó Ceallacháin. Related spellings: Callaghan, Callahan.
Looking for the O'Callaghan family crest? Read this first — arms belong to people, not surnames, and the honest version is more interesting. Tracing O'Callaghan ancestors? The step-by-step guide.
Not your spelling? Try the full A–Z. Know more about the O'Callaghan name? Add to the story.