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Last name Kwasniak (Kwasniak ) , throughout the world, is quite a rare surname. The cognomen Kwasniak is characteristic of Poland, where it is quite a rare surname, Ireland, where it is a rare surname, and Czechia. Not in comparison with a country's population, the name is most common in Poland, the United States, and Germany. More frequently, Kwasniak is the forename as well as the last name.