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Cognomen Robak (Robak , روباك , Робак ) , all over the world, is quite a common last name. The cognomen Robak is habitual in Poland, where it is quite a common surname, Ukraine, where it is quite a rare surname, and Norway. Not in comparison with a country's population, the name is most common in Poland, the United States, and Ukraine. Also, Robak is the forename as well as the last name.