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Cognomen Ryun (ライアン , Ryun , 赖恩 ) , throughout the world, is a rare last name. The cognomen Ryun is characteristic of Japan, where it is a rare surname, Malaysia, and the United States, where it is a very rare surname. Measured by absolute frequency, the name is most common in Japan, the United States, and China. Likewise, Ryun is the forename as well as the last name.