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Cognomen Seier (Sejr , Seier , Sigr ) , in the world, is quite a rare last name. The last name Seier is habitual in Denmark, where it is quite a rare surname, Austria, and Germany, where it is a rare surname. Not in comparison with a country's population, it most frequently occurs in Germany, the United States, and Denmark. Much less frequently, Seier is the forename as well as the last name.