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Cognomen Muff (Mof , Muff , Муфф ) , in the world, is quite a common family name. The last name Muff is habitual in Switzerland, where it is quite a common surname, Denmark, where it is quite a rare surname, and Libya, where it is a rare surname. In absolute terms, it most frequently occurs in Switzerland, the United States, and Germany. Much less frequently, Muff is the forename as well as the last name.