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Last name Avun (อรุณ , Avun , Авун) , worldwide, is quite a rare surname. The cognomen Avun is characteristic of Thailand, where it is quite a rare surname, Turkey, where it is a rare surname, and Malaysia, where it is a very rare surname. In absolute terms, it is commonest in Thailand, Turkey, and Indonesia. Predominantly, Avun is the forename as well as the last name.