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).
Spanish: from a variant of sedeño ‘silken’ or ‘cloth (or rope) of tow’, also ‘bristle’, possibly used as a nickname in the sense of Catalan sedeny ‘very strong man’. This name is common in many parts of Latin America and in the Philippines, but rare in Spain itself.