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Last name Mastr (Mast , Mastr ) , throughout the world, is a common family name. The cognomen Mastr is habitual in Western Europe, particularly Netherlands, where it is quite a common surname, Switzerland, where it is quite a rare surname, and Germany. Not in comparison with a country's population, it most frequently occurs in the United States, Germany, and Netherlands. Also, Mastr is the forename as well as the last name.