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Surname Hajduk (Hajduk , Hajdú , Хайдук ) , in the world, is a common cognomen. The cognomen Hajduk is characteristic of Slovakia, where it is quite a common surname, Poland, and Croatia (explore the name in all countries). Not in comparison with a country's population, the name is most common in Poland, Hungary, and the United States. Also, Hajduk is the forename as well as the last name.