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All around the world, 卡伊 (Kai , Kaj , 卡伊 ) is a common unisex first name. The forename 卡伊 is habitual in Macao, where it is quite a common epicene name, Guam, where it is quite a common feminine name, and Hong Kong, where it is quite a common dominantly male, but seldom feminine name (explore the name in all countries). In absolute terms, it is commonest in India, Germany, and the United States. Also, 卡伊 is the last name as well as the forename.
卡伊 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.