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Worldwide, יי (Yi , יי ) is a common unisex first name. The forename יי is characteristic of Eastern Asia, particularly Mongolia, where it is a prevalent principally female, but very seldom masculine name, Macao, where it is quite a common epicene name, and Hong Kong (explore the name in all countries). Not in comparison with a country's population, it is commonest in Mongolia, China, and the United States. Likewise, יי is the last name as well as the forename.
יי is also a name for the fictitious and mythical characters: .