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Family name Sierant (Sierant , Серант ) , in all the world, is quite a rare last name. The cognomen Sierant is habitual in Poland, where it is quite a rare surname, Denmark, where it is a rare surname, and Slovakia. Measured by absolute frequency, it most frequently occurs in Poland, the United States, and Ukraine. Likewise, Sierant is the forename as well as the last name.