Family name Iustin (Iustin 
, Юстин 
, Јустин 
) , across the world, is quite a rare last name. The last name Iustin is characteristic of Romania, where it is quite a rare surname, Austria, where it is a rare surname, and Ukraine. Not in comparison with a country's population, it is commonest in Eastern Europe, particularly Romania, Ukraine, and Russia. More prevalently, Iustin is the forename as well as the last name.