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Family name Claes (Claes , Клас , كلايس) , all around the world, is a common surname. The cognomen Claes is habitual in Belgium, where it is a common surname, Gabon, where it is quite a rare surname, and Luxembourg. Not in comparison with a country's population, this name is the most popular in Western Europe, particularly Belgium, Germany, and France. Also, Claes is the forename as well as the last name.