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Cognomen Tangen (Tangen , Танген , تانجين) , across the world, is quite a common last name. The cognomen Tangen is characteristic of Northern Europe, particularly Norway, where it is quite a common surname, Sweden, where it is quite a rare surname, and Denmark, where it is a rare surname. Measured by absolute frequency, it is commonest in Norway, the United States, and Indonesia. Much less frequently, Tangen is the forename as well as the last name.