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In all the world, Jacek (Jacek , ג'ק , Яцек ) is a common boy's forename. The first name Jacek is characteristic of Poland, where it is a common male name, Ireland, where it is quite a rare boy's name, and Germany. In absolute terms, it is the most numerous in Poland, Germany, and the United Kingdom. More frequently, Jacek is the last name as well as the forename.
Jacek is also a prevalent name for the fictitious and mythical characters: Jack Bauer , the character from the television series 24; Jack Reacher , the fictional character, Jack Reacher; Captain Jack Sparrow , the fictional character and the protagonist of the Pirates of the Caribbean film series, Pirates of the Caribbean: On Stranger Tides; Jack Harkness , the fictional character of Doctor Who and Torchwood and Jacek Soplica , the fictional character, Pan Tadeusz, and in many other works.