Pet form of any of the given names beginning with the letter D- (compare Jay and Kay), in particular Dorothy. It is also used as an independent name, and may in some cases be associated with the River Dee (compare Clyde).
Irish: 1. (predominantly southern) Anglicized form of Gaelic Ó Braonáin ‘descendant of Braonán’, a personal name from a diminutive of braon ‘moisture’, ‘drop’. Compare Breen. 2. (predominantly northern) Anglicized form of Gaelic Ó Branáin ‘descendant of Branán’, a personal name meaning ‘little raven’ (see Brannigan).