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Family name Ryeo (Ryeo , เรียว ) , all around the world, is a rare surname. The cognomen Ryeo is characteristic of South Korea, where it is a rare surname, Vietnam, where it is a very rare surname, and Thailand, where it is an extremely rare surname. Not in comparison with a country's population, it is commonest in South Korea, Vietnam, and China. Also, Ryeo is the forename as well as the last name.