As a boy's name this is a pet form of Jeremy or Gerald, or occasionally of Gerard and Jerome. As a girl's name it is a variant spelling of Gerry, and is sometimes bestowed as an independent given name, as in the case of the American model and actress Jerry Hall (b. 1956).
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).