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Cognomen Mussen (Mussen , 马森 ) , in all the world, is a rare last name. The surname Mussen is characteristic of Belgium, where it is quite a rare surname, New Zealand, where it is a rare surname, and the United Kingdom. In absolute terms, the name is most common in the United States, Belgium, and Ethiopia. Much less frequently, Mussen is the forename as well as the last name.