The surname 'Obrien' is of Irish origin, derived from the Gaelic Ó Briain, meaning 'descendant of Brian'. The name Brian itself comes from the Old Celtic word "brígh," which translates to 'noble' or 'high'. The O'Brien clan is one of the oldest and most distinguished in Ireland, with a history dating back to the 10th century. They were historically kings of Thomond, a region in present-day County Clare and County Limerick.
The U.S. Census places the last name Obrien at rank #258, with about 118557 people sharing the name nationwide. That’s roughly 40 per 100,000 citizens.
Our database contains over 48050 people with the last name Obrien. This surname is most commonly found in Florida, California, New York. We have over 34 unique first names combined with the last name Obrien in our records. The most frequent first names associated with this surname are Michael, John, Patrick.
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