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Cognomen Pieniazek (Pieniazek ) , all around the world, is quite a rare surname. The family name Pieniazek is characteristic of Poland, where it is quite a rare surname, Ireland, where it is a rare surname, and Argentina, where it is a very rare surname. Not in comparison with a country's population, it is the most numerous in Poland, the United States, and Germany. More frequently, Pieniazek is the forename as well as the last name.