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Family name Klena (Klena , Клена , كلينا) , around the world, is a rare cognomen. The family name Klena is habitual in Slovakia, where it is quite a rare surname, Hungary, where it is a rare surname, and Denmark. Measured by absolute frequency, it most frequently occurs in the United States, Slovakia, and Argentina. Likewise, Klena is the forename as well as the last name.