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Surname Mastro (Mast , Magister , Mastro ) , worldwide, is a common last name. The surname Mastro 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, this name is the most popular in the United States, Germany, and Netherlands. Likewise, Mastro is the forename as well as the last name.