Of uncertain origin, possibly an Anglicized or pet form of the Spanish name Alonso or a variant of Lenny. It is associated in Britain with the skiffle singer Lonnie Donegan (1931–2002, born Anthony Donegan), famous in the 1950s and 60s.
English and Welsh: patronymic from the Middle English personal name Jon(e) (see John). The surname is especially common in Wales and southern central England. In North America this name has absorbed various cognate and like-sounding surnames from other languages. (For forms, see Hanks and Hodges 1988).