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Surname Aasen (Aasen , 奥森 , Осен ) , all over the world, is quite a common cognomen. The family name Aasen is habitual in Norway, where it is a common surname, Canada, where it is a rare surname, and Sweden. Measured by absolute frequency, it is the most numerous in Norway, the United States, and Canada. Much less frequently, Aasen is the forename as well as the last name.