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Family name Franczak (Franczak , Франчак ) , throughout the world, is quite a common last name. The family name Franczak is habitual in Poland, where it is quite a common surname, Luxembourg, where it is quite a rare surname, and Ireland, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Poland, the United States, and Brazil. Likewise, Franczak is the forename as well as the last name.