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Family name Kruth (Kruth , ครุธ , クルト) , across the world, is quite a rare cognomen. The family name Kruth is habitual in Sweden, where it is quite a rare surname, Germany, where it is a rare surname, and Finland. Measured by absolute frequency, this name is the most popular in Germany, the United States, and France. Very seldom, Kruth is the forename as well as the last name.