19,160 O'CALLAGHAN members around the world
Stay informed about O'CALLAGHAN Family online & offline events!
See one of our recent Ireland101 Tribe Gatherings
O'CALLAGHAN Family HistoryThis surname means descendent of Ceallach?n who was the E?ganachta King of Munster from AD 935 until 954. The personal name Cellach means 'bright-headed'. The principal sept of the name Callaghan were lords of Cine?l Aodha in South Cork originally. This area is west of Mallow along the Blackwater river valley. The family were dispossessed of their ancestral home and 24,000 acres (97 km2) by the Cromwellian Plantation and settled in East Clare.
Who have we missed?
Tell us about any famous O'CALLAGHAN (or surname variant) you think we should add here. We will get our genealogists to check them out and add them to the list. Thanks!
Join the conversation with the O'CALLAGHAN tribe
- Find your O'CALLAGHAN ancestor
- Tell us about your O'CALLAGHAN Family
- Tell us about your O'CALLAGHAN ancestors
- Ask a question about the O'CALLAGHAN history
- Leave a message for O'CALLAGHAN family members
Areas of Origin for O'CALLAGHAN
Invite more O'CALLAGHAN family members!
Write an email address and click 'Invite' to share this page with more members of the O'CALLAGHAN tribe.
Family Coat of Arms Generator
Why not see what your family crest could look like based on your own family characteristics?Create Crest