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Surname Reyn (Reyn , Рейн , Реин ) , across the world, is quite a rare last name. The last name Reyn is characteristic of Reunion, where it is quite a common surname, Kazakhstan, where it is quite a rare surname, and Belgium, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Russia, Kazakhstan, and Indonesia. Likewise, Reyn is the forename as well as the last name.