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Cognomen Runiu (Runiu ) , in the world, is an extremely rare family name. Much more frequently, Runiu is the forename as well as the last name.
Руню, 乳牛, 儒牛, 如妞, 如牛, 孺牛, 汝牛, 罗妞, 茹妞, and 铷妞
Da, Guo, and Fang