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Surname Dijak (Dijak , Διάκος , Дижак ) , throughout the world, is a rare family name. The family name Dijak is characteristic of Slovenia, where it is quite a rare surname, Croatia, and Lithuania, where it is a rare surname. Not in comparison with a country's population, it is the most numerous in the United States, Slovenia, and Croatia. Likewise, Dijak is the forename as well as the last name.