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Last name זק (Zak , Zack , Sack ) , in the world, is a common surname. The surname זק is habitual in Slovakia, where it is a common surname, Czechia, where it is quite a common surname, and Brunei (explore the name in all countries). In absolute terms, it is commonest in the United States, Germany, and Poland. Also, זק is the forename as well as the last name.