All around the world, กัย (Kai 
, กัย 
) is a common gender-neutral first name. The first name กัย is characteristic of Macao, where it is quite a common unisex name, Guam, where it is quite a common female name, and Hong Kong, where it is quite a common mostly male, but seldom girly name (explore the name in all countries). In absolute terms, it is the most numerous in India, Germany, and the United States. Likewise, กัย is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Kai | Germany, Malaysia, China, India, Myanmar |
| กัย | Thailand |
กัย is also a popular name for the fictitious and mythical characters: 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; Kai , the imaginary figure from the TV series ''Lego Ninjago", The Lego Ninjago Movie and Kai , the character in The Legend of Korra, and in many other works.