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Cognomen Masior (Masior ) , in all the world, is a rare family name. The family name Masior is habitual in Poland, where it is a rare surname, Germany, where it is a very rare surname, and Canada, where it is an extremely rare surname. In absolute terms, it is commonest in Poland, Germany, and the United Kingdom. More frequently, Masior is the forename as well as the last name.