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Last name Nayun (Nayun , 나윤 ) , around the world, is a rare family name. The last name Nayun is characteristic of South Korea, where it is a rare surname, Malaysia, where it is a very rare surname, and New Zealand. In absolute terms, it is the most numerous in South Korea, Indonesia, and Malaysia. More prevalently, Nayun is the forename as well as the last name.