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Family name Mansuetus (Mansuetus , Mastino , MastÃn) , worldwide, is a rare last name. The surname Mansuetus is characteristic of Panama, where it is quite a rare surname, Italy, and Switzerland, where it is a rare surname. Not in comparison with a country's population, the name is most common in Italy, Panama, and Philippines. Very seldom, Mansuetus is the forename as well as the last name.