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Surname Jacek (Jacek , ג'ק , Яцек ) , in all the world, is a widespread family name. The surname Jacek is characteristic of Eastern Europe, particularly Poland, where it is a prevalent surname, Hungary, where it is quite a rare surname, and Slovakia. Measured by absolute frequency, the name is most common in Poland, the United States, and Germany. Much less frequently, Jacek is the forename as well as the last name.