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Globally, うい (Ui , うい) is quite a rare epicene forename. The forename うい is characteristic of Nigeria, where it is a rare predominantly masculine, but very infrequently female name, Saudi Arabia, where it is a rare unisex name, and Indonesia. Measured by absolute frequency, it most frequently occurs in India, China, and Nigeria. Likewise, うい is the last name as well as the forename.
うい is also a name for the fictitious and mythical characters: Ui Hirasawa , the fictional character from K-On!.