English form of the Latin name Justinus, a derivative of Justus. The name was borne by various early saints, notably a 2nd-century Christian apologist and a (possibly spurious) boy martyr of the 3rd century. Justin has enjoyed considerable popularity since the second half of the 20th century, reinforced latterly perhaps by the popularity of American singer Justin Timberlake (b. 1981).
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).