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Family name Masto (Mast , Masto , Масто ) , all around the world, is a common cognomen. The surname Masto is characteristic of Western Europe, particularly Netherlands, where it is quite a common surname, Switzerland, where it is quite a rare surname, and Germany. In absolute terms, it most frequently occurs in the United States, Germany, and Pakistan. Likewise, Masto is the forename as well as the last name.