O'bryan

O'Bryan is an anglicized form of the Irish Gaelic surname Ó Briain, which means 'descendant of Brian'. The name Brian itself is of uncertain origin, but is thought to be derived from an Old Celtic word meaning 'high, noble' or possibly 'hill'. The Ó Briain clan was one of the most powerful and prominent families in medieval Ireland, tracing their lineage back to Brian Boru, the High King of Ireland who died at the Battle of Clontarf in 1014.

Over centuries, as Irish names were anglicized, Ó Briain became O'Brien, and less commonly, O'Bryan. While primarily a surname, it has occasionally been adopted as a given name, particularly in areas with strong Irish heritage. Its use as a first name is relatively modern and uncommon, often chosen to honor family lineage.