There are
3014
Ocallaghans in the USA
Ocallaghan is the
10626th
most common last name in the USA

Historical figures and celebrities called Ocallaghan

CorneliusO'Callaghan

Cornelius O'Callaghan was an Irish lawyer and politician. He served as a Member of Parliament in the early 19th century.

MaeveO'Callaghan

Maeve O'Callaghan was a renowned Irish poet and author, known for her powerful and emotive poetry that reflects the struggles of Irish society.

BrianO'Callaghan

Brian O'Callaghan was a prominent Irish historian who specialized in medieval history. His works shed light on the rich cultural heritage of Ireland during that era.

SiobhanO'Callaghan

Siobhan O'Callaghan was an influential Irish feminist and activist who fought for women's rights and equality throughout the 20th century.

SeanO'Callaghan

Sean O'Callaghan was an Irish republican and former member of the Provisional Irish Republican Army (IRA). He later became a prominent author, providing insights into IRA operations.

Ocallaghan Genealogy

OriginsThe surname O'Callaghan originates from Ireland.
Geographic DistributionIt is predominantly found in the counties of Cork and Limerick in Ireland.
VariationsIt is sometimes spelled as O'Callahan.
Migration and ImmigrationMigration and immigration of the O'Callaghan surname occurred throughout history, primarily due to economic factors such as the Great Famine in the mid-19th century. Many O'Callaghan families emigrated to countries like the United States, Canada, and Australia in search of better opportunities.