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Surname Wolak (Wolak , ولاك ) , worldwide, is quite a common cognomen. The last name Wolak is characteristic of Poland, where it is quite a common surname, Ireland, where it is a rare surname, and the United States. Not in comparison with a country's population, it is the most numerous in Poland, the United States, and Germany. Also, Wolak is the forename as well as the last name.