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Family name Suin (Suin , 수인 , Суин ) , in the entire world, is quite a rare last name. The family name Suin is habitual in Malaysia, where it is quite a rare surname, South Korea, and France, where it is a rare surname. In absolute terms, this name is the most popular in India, South Korea, and Malaysia. Also, Suin is the forename as well as the last name.