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Cognomen Haiyun (海云 , Haiyun , 海芸 ) , in the world, is a common family name. The cognomen Haiyun is habitual in China, where it is quite a rare surname, Malaysia, where it is a rare surname, and Bulgaria. Measured by absolute frequency, it is commonest in China, Malaysia, and Indonesia. More frequently, Haiyun is the forename as well as the last name.