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irish
*brano > bran > Ó Broin

This name derives from the Irish surname “Ó Broin”, meaning “descendent of Bran”, from the Old Irish “bran”, which in turn derives from the Proto-Celtic “*brano”, meaning “raven, crow, European carrion crow (Corvus corone)”. The name has been traced back to the ancient Celtic chieftain, Bran mac Máelmórda, King of Leinster, deposed in 1018, (d. 1052), who belonged to the Uí Dúnlainge dynasty. He was descended from Cathair Mór, an earlier king of Leinster, who was, according to medieval Irish legend and historical tradition, also monarch of all Ireland around 200 AD.

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