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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.
The second possible derivation of the name is from the Old French deien, dien, dean (a term ultimately from the Latin decanus, leader of ten men), introduced into England after the Norman Conquest of 1066 and borrowed into Middle English as deen.