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Last name Gündüz (Gündüz , Гюндюз , غوندوز) , around the world, is a widespread cognomen. The surname Gündüz is characteristic of Western Asia, particularly Turkey, where it is a common surname, Cyprus, where it is quite a rare surname, and Azerbaijan. In absolute terms, this name is the most popular in Turkey, Germany, and Azerbaijan. Much less frequently, Gündüz is the forename as well as the last name.