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Family name Stepien (Stepien , Stępień ) , throughout the world, is a common last name. The cognomen Stepien is habitual in Poland, where it is quite a common surname, Ireland, where it is quite a rare surname, and France. Not in comparison with a country's population, the name is most common in Poland, the United States, and France. Likewise, Stepien is the forename as well as the last name.