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Cognomen Klapp (Klapp , Клапп ) , throughout the world, is quite a rare surname. The cognomen Klapp is habitual in Luxembourg, where it is quite a rare surname, Germany, and Chile, where it is a rare surname. Measured by absolute frequency, the name is most common in Germany, the United States, and Chile. Very seldom, Klapp is the forename as well as the last name.