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Last name Marciniak (Marciniak , Марциняк ) , across the world, is a common family name. The family name Marciniak is characteristic of Poland, where it is quite a common surname, France, where it is quite a rare surname, and Ireland. Not in comparison with a country's population, the name is most common in Poland, the United States, and Germany. Likewise, Marciniak is the forename as well as the last name.