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Family name Siun (Siun , Сюн , Сиун ) , globally, is quite a rare last name. The last name Siun is characteristic of Malaysia, where it is a rare surname, Indonesia, and Kyrgyzstan, where it is a very rare surname. In absolute terms, it most frequently occurs in Indonesia, Malaysia, and Russia. Likewise, Siun is the forename as well as the last name.