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Family name Slon (Slon , สลอน , Слонь ) , in the world, is quite a rare last name. The cognomen Slon is habitual in Costa Rica, where it is quite a rare surname, Poland, where it is a rare surname, and Ukraine. Measured by absolute frequency, it most frequently occurs in Ukraine, Poland, and Philippines. Likewise, Slon is the forename as well as the last name.