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).
English: from the Old French personal name Humfrey, introduced to Britain by the Normans. This is composed of the Germanic elements hūn ‘bear cub’ + frid, fred ‘peace’. It was borne by a 9th-century saint, bishop of Therouanne, who had a certain following in England among Norman settlers.