Worldwide, Кэй (Kay 
, Kaye 
, Kei , and others...) is a widespread epicene first name. The first name Кэй is habitual in Macao, where it is a common unisex name, Botswana, where it is quite a common gender-neutral name, and Hong Kong (explore the name in all countries). Not in comparison with a country's population, the name is most common in India, the United States, and the United Kingdom. Likewise, Кэй is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Kei, Kay | Mongolia, Myanmar, India, United States, United Kingdom |
| Kaye | Myanmar, Malaysia, India, United States, United Kingdom |
| Kej | Malaysia, India, Indonesia, United States, United Kingdom |
| Кэй | Kazakhstan, Russia |
Кэй is also a prevalent name for the fictitious and mythical characters: Kay Adams-Corleone , the fictional character from The Godfather series; Crazy Jane , the fictional character, Doom Patrol; Kay Scarpetta , the fictional character in works by Patricia Cornwell; Sir Kay , the fictional character from Disney's The Sword in the Stone and Kei Shirogane , the fictional character from Kaguya-sama: Love is War, and in many other works.