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Throughout the world, Seyi (Seyi , セイ ) is a common epicene first name. The first name Seyi is characteristic of Nigeria, where it is quite a common gender-neutral name, the United Kingdom, where it is a rare epicene name, and South Africa, where it is a very rare unisex name. Not in comparison with a country's population, it most frequently occurs in Nigeria, the United Kingdom, and the United States. Also, Seyi is the last name as well as the forename.
Seyi is also a name for the fictitious and mythical characters: Sei Asagiri , the fictional character from VA-11 HALL-A: "devoted Valkyrie of the White Knights, a band of para-military enforcers keeping the tenuous peace in Glitch City".