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Family name Dyjak (Dyjak , Дыяк ) , throughout the world, is quite a rare surname. The family name Dyjak is habitual in Poland, where it is quite a rare surname, Czechia, where it is a rare surname, and New Zealand. Not in comparison with a country's population, this name is the most popular in Poland, the United States, and France. Likewise, Dyjak is the forename as well as the last name.