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Cognomen Onuk (Onuk , Онук ) , across the world, is quite a common last name. The family name Onuk is habitual in Turkey, where it is quite a rare surname, Slovenia, and Austria, where it is a rare surname. Not in comparison with a country's population, this name is the most popular in Turkey, Ukraine, and Nigeria. Much less frequently, Onuk is the forename as well as the last name.