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Surname פרוס (Prus , פרוס ) , globally, is quite a common last name. The cognomen פרוס is habitual in Poland, where it is quite a common surname, Slovenia, where it is quite a rare surname, and Estonia. Not in comparison with a country's population, it is commonest in Poland, the United States, and Germany. Likewise, פרוס is the forename as well as the last name.