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Last name Ersun (Ersun , Ерсун ) , all around the world, is a rare cognomen. The family name Ersun is characteristic of Brunei, where it is quite a rare surname, North Macedonia, and Turkey, where it is a rare surname. In absolute terms, this name is the most popular in Turkey, Indonesia, and North Macedonia. More prevalently, Ersun is the forename as well as the last name.