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Surname Koseoglu (Koseoglu , Косеоглу ) , throughout the world, is quite a rare last name. The surname Koseoglu is characteristic of Turkey, where it is a rare surname, France, and Netherlands. Not in comparison with a country's population, the name is most common in Turkey, France, and the United States. Very seldom, Koseoglu is the forename as well as the last name.