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Cognomen Nain (Nain , ナイン , Наин ) , across the world, is a common last name. The family name Nain is characteristic of Brunei, where it is quite a common surname, Malaysia, where it is quite a rare surname, and Cameroon. Measured by absolute frequency, the name is most common in India, Indonesia, and Myanmar. Likewise, Nain is the forename as well as the last name.