There are
363
Ocallahans in the USA
Ocallahan is the
56310th
most common last name in the USA

Historical figures and celebrities called Ocallahan

DanielO'Callaghan

Daniel O'Callaghan was an Irish politician and statesman, known for his efforts in advocating for Irish independence and playing a key role in the negotiations for the Anglo-Irish Treaty.

MaeveCallaghan

Maeve Callaghan was an influential Irish author and poet, acclaimed for her works that explore themes of Irish identity, history, and folklore.

PatrickO'Callaghan

Patrick O'Callaghan was a renowned Irish scientist and inventor, notable for his contributions in the field of sustainable energy and his development of innovative technologies.

SiobhánCallahan

Siobhán Callahan was a celebrated Irish actress, known for her performances in both stage and screen productions, captivating audiences with her range and versatility.

SeanO'Callahan

Sean O'Callahan was a distinguished Irish journalist and war correspondent, recognized for his fearless reporting and insightful analyses of global conflicts.

Ocallahan Genealogy

OriginsThe OCallahan surname originated in Ireland and is primarily associated with Irish heritage.
Geographic DistributionThe OCallahan surname is most popular in Ireland, with a significant presence among Irish communities around the world including the United States, United Kingdom, Canada, and Australia.
VariationsVariations of the OCallahan surname include O'Callaghan and Callahan.
Migration and ImmigrationThe OCallahan family has a history of migration and immigration, particularly during periods of Irish emigration in the 19th and 20th centuries when many individuals sought opportunities in countries like the United States and Canada.