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Cognomen Klang (Klang , กลาง , กลัง ) , around the world, is quite a rare family name. The last name Klang is habitual in Sweden, where it is quite a common surname, Finland, where it is quite a rare surname, and Germany. Not in comparison with a country's population, this name is the most popular in Sweden, Germany, and the United States. Much less frequently, Klang is the forename as well as the last name.