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Family name Claessens (Claessens ) , around the globe, is quite a common last name. The family name Claessens is habitual in Western Europe, particularly Belgium, where it is quite a common surname, Netherlands, and Luxembourg, where it is quite a rare surname. Not in comparison with a country's population, the name is most common in Western Europe, particularly Belgium, Netherlands, and France. Much less frequently, Claessens is the forename as well as the last name.