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Throughout the world, יאצק (Jacek , יאצק ) is a common boy's first name. The first name יאצק is habitual in Poland, where it is a common male name, Ireland, where it is quite a rare masculine name, and Germany. Not in comparison with a country's population, it is commonest in Poland, Germany, and the United Kingdom. More prevalently, יאצק is the last name as well as the forename.
יאצק 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 .