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Last name Klaun (Clown , Klaun , กล้า) , throughout the world, is a rare cognomen. The last name Klaun is characteristic of Belgium, where it is a rare surname, Netherlands, and Indonesia. Not in comparison with a country's population, it is commonest in Indonesia, China, and the United States. Very seldom, Klaun is the forename as well as the last name.