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Family name Semin (Semin , Семин , 瑟敏 ) , in the entire world, is a common last name. The last name Semin is habitual in Russia, where it is quite a common surname, Bosnia and Herzegovina, where it is quite a rare surname, and Belarus. In absolute terms, it is commonest in Russia, Indonesia, and Kazakhstan. Much less frequently, Semin is the forename as well as the last name.