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In the entire world, Яцек (Jacek , Яцек ) is a common boy's forename. The first name Яцек is characteristic of Poland, where it is a common boy's name, Ireland, where it is quite a rare male name, and Germany. Measured by absolute frequency, it is the most numerous in Poland, Germany, and the United Kingdom. More prevalently, Яцек is the last name as well as the forename.
Яцек is also a name for the fictitious and mythical characters: Jacek Soplica , the fictional character, Pan Tadeusz; Jacek Mal Doran , character in Stargate SG-1; Jacek Mejer , character in Na dobre i na złe and Jacek Kwiatkowski .