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Last name Sainun (Sainun , ไซนุน ) , throughout the world, is a rare cognomen. The surname Sainun is characteristic of Malaysia, where it is a rare surname, Indonesia, where it is a very rare surname, and Brazil, where it is an extremely rare surname. Not in comparison with a country's population, it most frequently occurs in Indonesia, Malaysia, and India. Also, Sainun is the forename as well as the last name.