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Surname Monsen (Monsen , 蒙森 , モンセン) , in all the world, is quite a rare cognomen. The last name Monsen is habitual in Northern Europe, particularly Norway, where it is quite a common surname, Denmark, where it is quite a rare surname, and Iceland. Measured by absolute frequency, it is the most numerous in Norway, the United States, and Denmark. Much less frequently, Monsen is the forename as well as the last name.