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Last name Yustin (Yustin , Юстин , Йустин ) , in the world, is quite a rare surname. The family name Yustin is characteristic of Tanzania, where it is quite a rare surname, Indonesia, where it is a rare surname, and Nicaragua. In absolute terms, it is the most numerous in Indonesia, Tanzania, and Mexico. More prevalently, Yustin is the forename as well as the last name.