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Surname Clausen (Clausen , ประโยค , Клаузен ) , around the globe, is a common last name. The family name Clausen is characteristic of Denmark, where it is a common surname, Greenland, where it is quite a common surname, and Norway (explore the name in all countries). In absolute terms, it most frequently occurs in Denmark, the United States, and Germany. Very seldom, Clausen is the forename as well as the last name.