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In all the world, カイ (Kai , Ky , カイ ) is a common unisex given name. The given name カイ is habitual in Macao, where it is quite a common epicene name, Guam, where it is quite a common girly name, and Hong Kong, where it is quite a common unisex name (explore the name in all countries). In absolute terms, it most frequently occurs in India, Germany, and the United States. Also, カイ is the last name as well as the forename.
カイ is also a popular name for the fictitious and mythical characters: Kaj , the fictional character from the Danish children's television show Kaj & Andrea; Kai Bartley , the fictional character from Grey's Anatomy; Kai Shiden , the fictional character from Mobile Suit Gundam; Kai von Mölln , the character from Thomas Mann's Buddenbrooks and Kai , the imaginary figure from the TV series ''Lego Ninjago", The Lego Ninjago Movie, and in many other works.