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Cognomen Oyan (Oyan , Оян ) , in all the world, is quite a rare last name. The last name Oyan is habitual in Turkey, where it is quite a rare surname, Philippines, where it is a rare surname, and Norway. Not in comparison with a country's population, the name is most common in Turkey, Philippines, and Indonesia. Much less frequently, Oyan is the forename as well as the last name.