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Last name Claeys (Claeys , Клайс ) , in the world, is a common surname. The last name Claeys is habitual in Western Europe, particularly Belgium, where it is quite a common surname, France, where it is quite a rare surname, and Luxembourg. Not in comparison with a country's population, this name is the most popular in Belgium, France, and the United States. Much less frequently, Claeys is the forename as well as the last name.