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Family name Bartnik (Bartnik , Бартник ) , in the entire world, is quite a common last name. The family name Bartnik is habitual in Poland, where it is quite a common surname, Germany, where it is quite a rare surname, and Ireland, where it is a rare surname. Not in comparison with a country's population, this name is the most popular in Poland, Germany, and the United States. Likewise, Bartnik is the forename as well as the last name.