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Cognomen Maassen (Maassen , ماسين , Маассен ) , all over the world, is quite a common surname. The family name Maassen is characteristic of Western Europe, particularly Netherlands, where it is quite a common surname, Germany, where it is quite a rare surname, and Luxembourg. Measured by absolute frequency, it is the most numerous in Germany, Netherlands, and the United States. Much less frequently, Maassen is the forename as well as the last name.