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Cognomen Mast (Mast , マスト , Маст ) , all over the world, is a common last name. The cognomen Mast is habitual in Western Europe, particularly Netherlands, where it is quite a common surname, Switzerland, where it is quite a rare surname, and Germany. Measured by absolute frequency, it most frequently occurs in the United States, Germany, and Netherlands. Also, Mast is the forename as well as the last name.