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Across the world, Ruhai (如海 , 汝海 , Ruhai ) is a common male first name. The given name Ruhai is characteristic of Aland Islands, where it is quite a common boy's name, China, where it is a rare boy's name, and India, where it is an extremely rare largely feminine, but seldom boy's name. Much less frequently, Ruhai is the last name as well as the forename.
Ruhai is also a name for the fictitious and mythical characters: .