Justin \j(u)-stin,jus-tin\ is pronounced JUS-tin. It is of Latin origin, and its meaning is "just, upright, righteous". Variant of Justus. Saint Justin (second century) was a Greek philosopher who wrote of the moral values of Christianity.
Justin has 18 variant forms: Giustino, Giusto, Joos, Joost, Justain, Justan, Just, Juste, Justen, Justinas, Justinian, Justinius, Justino, Justinus, Justis, Justo, Justus and Justyn.