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Cognomen Magnusen (Manson , Magnuson , Magnusen ) , across the world, is a common family name. The family name Magnusen is characteristic of Reunion, where it is quite a common surname, Isle of Man, and New Zealand. Not in comparison with a country's population, it is commonest in the United States, the United Kingdom, and Australia. Much less frequently, Magnusen is the forename as well as the last name.