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Cognomen Demuth (Demuth , Демут ) , across the world, is quite a common surname. The last name Demuth is habitual in Aland Islands, where it is quite a common surname, Luxembourg, and Switzerland, where it is quite a rare surname. Not in comparison with a country's population, it is commonest in Germany, the United States, and Switzerland. Much less frequently, Demuth is the forename as well as the last name.