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Across the world, クラース (Klaas , Class , クラース) is a common boy's given name. The given name クラース is habitual in Netherlands, where it is quite a common boy's name, South Africa, and Belgium, where it is quite a rare male name. Not in comparison with a country's population, it is commonest in South Africa, Netherlands, and Germany. Likewise, クラース is the last name as well as the forename.
クラース is also a name for the fictitious and mythical characters: Klaas Guts ; Klaas Vermeulen and Klaas , the operatic character in the opera Die Entführung aus dem Serail by Wolfgang Amadeus Mozart.