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Cognomen Klap (Klap , กลับ , Klaff ) , all over the world, is quite a rare last name. The last name Klap is habitual in Netherlands, where it is quite a rare surname, Estonia, where it is a rare surname, and New Zealand. Measured by absolute frequency, it most frequently occurs in Netherlands, the United States, and Germany. Much less frequently, Klap is the forename as well as the last name.