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Around the world, சாய் (Cai , Tsai , சாய்) is a common gender-neutral forename. The first name சாய் is characteristic of Eastern Asia, particularly Macao, where it is quite a common gender-neutral name, Taiwan, and Hong Kong, where it is quite a rare gender-neutral name. In absolute terms, it is the most numerous in China, Taiwan, and the United States. Predominantly, சாய் is the last name as well as the forename.
சாய் is also a name for the fictitious and mythical characters: .