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Cognomen Ruo (Ruo , 偌 , روو ) , all over the world, is quite a common last name. The surname Ruo is habitual in Kenya, where it is quite a rare surname, Italy, where it is a rare surname, and Malaysia. Not in comparison with a country's population, the name is most common in China, Kenya, and Italy. Also, Ruo is the forename as well as the last name.