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Last name Ustun (Ustun , Устун ) , all around the world, is quite a rare cognomen. The family name Ustun is characteristic of Azerbaijan, where it is quite a rare surname, Turkey, where it is a rare surname, and Denmark. Not in comparison with a country's population, the name is most common in Turkey, France, and Azerbaijan. Very seldom, Ustun is the forename as well as the last name.