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Cognomen Mroz (Mroz , Mross , Мроз ) , around the world, is a common surname. The cognomen Mroz is habitual in Poland, where it is quite a common surname, Cyprus, where it is quite a rare surname, and Germany. In absolute terms, the name is most common in Poland, the United States, and Germany. Much less frequently, Mroz is the forename as well as the last name.