Meaning A boy's name of Celtic origin, it means "Strong; He ascends 10th century Brian Boru was a high king and great national hero of Ireland." Origin of Briant Celtic , Irish Popular Middle Names Pronunciation 🔊 Listen Briant Similar Names Bryan Aswynn Bressal Bartlett Bitten Alson Brian Bholanath Erin Trevet Year by Year Popularity of Briant