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Last name Boysen (Boysen , Бойсен ) , in the entire world, is quite a common cognomen. The surname Boysen is habitual in Denmark, where it is quite a common surname, Namibia, where it is quite a rare surname, and Germany. In absolute terms, it is commonest in Germany, the United States, and Denmark. Very seldom, Boysen is the forename as well as the last name.