Pet form of John, also used as an independent given name from the 16th century onwards. In the United States it is occasionally also used as a girl's name. Famous bearers include the American country singer Johnny Cash (1932–2003) and the film actor Johnny Depp (b. 1963).
French: habitational name from places called La Noue, this name being derived from a Gaulish word nauda ‘water meadow’, ‘boggy place’. This is a Canadian secondary surname for Laigu, Laleu, and Robutel, recorded there since 1687.