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Cognomen Johnsen (Johnsen , Йонсен , ヨンセン) , all over the world, is a common last name. The family name Johnsen is characteristic of Norway, where it is a common surname, Greenland, where it is quite a common surname, and Denmark (explore the name in all countries). Measured by absolute frequency, the name is most common in Norway, the United States, and Denmark. Very seldom, Johnsen is the forename as well as the last name.