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Cognomen Naoki (Naoki , ナオキ , Наоки ) , across the world, is a widespread surname. The last name Naoki is habitual in Japan, where it is a common surname, Iran, where it is a rare surname, and Singapore. Measured by absolute frequency, it is commonest in Japan, China, and Iran. Very seldom, Naoki is the forename as well as the last name.