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This is an Irish surname which derives from the ancient pre 9th century Gaelic O'Duibhgeannain. The translation is 'the descendant of the sons of the black haired chief' (or similar), and it is claimed that the clan were the poets and bards to the leading clans of the counties Leitrim, Roscommon, and Longford.
Brannon Early Origins. Buy PDF History Â». The surname Brannon was first found in County Kilkenny (Irish: Cill Chainnigh), the former Kingdom of Osraige (Ossory), located in Southeastern Ireland in the province of Leinster, where the family claim descent from Braonan, an Irish Prince, brother of Ceallach, 17th King of Ossory.