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).
Scottish and northern Irish: Anglicized form of Gaelic Mac Gille Fhionndaig (Scottish), Mac Giolla Fhionntóg (Irish) ‘son of the servant of (Saint) Finndag’, a personal name derived from a pet form of fionn ‘white’. According to Woulfe, the Scottish family settled in Donegal in the late 16th century.