Summary

Irish in origin, the surname O'Reilly is derived from the Gaelic name Ó Raghallaigh, meaning 'descendant of Raghallach'. The O'Reilly clan was a prominent sept in ancient Ireland, known for their valor and leadership. Today, the surname is widely spread around the world, particularly in countries with Irish diaspora.
There are
12074
Oreillys in the USA
Oreilly is the
2970th
most common last name in the USA

Historical figures and celebrities called Oreilly

BillO'Reilly

Bill O'Reilly is a former American television host, journalist, and political commentator. He hosted the popular talk show 'The O'Reilly Factor' on Fox News for over 20 years.

MauraO'Reilly

Maura O'Reilly is an Irish actress known for her roles in films like 'The Galway Girl' and 'The Quiet Man.' She is also a prominent advocate for women's rights in Ireland.

JohnBoyle

John Boyle O'Reilly was an Irish-American poet, journalist, and activist. He played a significant role in the Irish nationalist movement and was known for his poetry and writings.

ConanO'Brien

Conan O'Brien is an American television host, comedian, and writer. He is best known for hosting the late-night talk show 'Conan' and previously 'The Tonight Show with Conan O'Brien.'

TaraO'Reilly

Tara O'Reilly is an Australian actress known for her roles in television shows such as 'Neighbours' and 'Home and Away.' She has also appeared in several stage productions.

PatrickO'Riley

Patrick O'Riley was an Irish-American politician who served as a U.S. Senator from Illinois in the late 19th century. He was known for his advocacy for workers' rights.

SineadO'Reilly

Sinead O'Reilly is an Irish singer-songwriter known for her soulful and powerful vocals. She has released several successful albums and has gained a loyal fan base.

FrankO'Reilly

Frank O'Reilly is a historian and author specializing in the American Civil War. He has written several books on the subject and has been a consultant for numerous documentaries.

MaureenO'Riley

Maureen O'Riley is an American fashion designer known for her elegant and sophisticated designs. Her creations have been worn by many celebrities and featured in top fashion magazines.

LiamO'Reilly

Liam O'Reilly is an Irish journalist and broadcaster. He has worked for several major news outlets and is known for his insightful analysis and reporting.

Oreilly Genealogy

OriginsThe surname 'O'Reilly' is of Irish origin. It is an anglicized form of the Irish Gaelic name 'Ó Raghallaigh,' which means 'descendant of Raghallaigh.' The name Raghallaigh is derived from the Gaelic word 'raghallach,' which means 'impulsive' or 'reckless.' The O'Reilly clan was historically associated with County Cavan in Ireland.
Geographic DistributionThe surname 'O'Reilly' is most commonly found in Ireland, particularly in County Cavan. It is also found among Irish diaspora communities in countries such as the United States, Canada, Australia, and the United Kingdom.
VariationsVariations of the surname 'O'Reilly' include 'O Riley,' 'Riley,' 'O Reilly,' 'Reilley,' 'O Rourke,' 'Orailey,' 'O Rielly,' 'Reilly,' and 'Reiley.'
Migration and ImmigrationMany individuals with the surname 'O'Reilly' emigrated from Ireland to countries such as the United States, Canada, Australia, and the United Kingdom during periods of Irish migration and immigration. They sought opportunities for a better life and contributed to the cultural diversity of their new homelands.