Cognomen ケイ (Kay 
, Kaye 
, Kei 
, and others...) , all over the world, is a widespread last name. The family name ケイ is characteristic of Mongolia, where it is a widespread surname, Myanmar, where it is a common surname, and Isle of Man, where it is quite a common surname (explore the name in all countries). Not in comparison with a country's population, it is commonest in India, Japan, and Myanmar. Likewise, ケイ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kay | United Kingdom, United States, India, Myanmar, Mongolia |
| Keye, Kaye | United Kingdom, Malaysia, United States, India, Myanmar |
| Kei | Japan, United States, India, Myanmar, Mongolia |
| ケイ | Japan |
| 前田ケイ JP (b. 1931) |
|
|
| 遠藤ケイ Japanese illustrator, JP (b. 1944) |
|
|
| 真梨邑ケイ Japanese jazz singer, idol and pornographic actress, JP (b. 1957) |
|
|
| 石黒ケイ Japanese actress, JP (b. 1958) |
|
|
| 小泉ケイ Japanese AV idol, JP (b. 1967) |
|
|
| ナガセケイ Japanese actor, JP (b. 1968) |
|
|
| 水谷ケイ Japanese adult video actress, JP (b. 1974) |
|
|
| 佐藤ケイ Japanese novelist, JP (b. 1976) |
|
|
| 平松ケイ Japanese AV idol, JP (b. 1976) |
|
|
| 神楽坂ケイ Japanese AV idol, JP (b. 1977) |
|
|
| 池上ケイ Japanese singer-songwriter, JP (b. 1979) |
|
|
| 富樫ケイ Japanese seiyū, JP |
|
|
| 草村ケイ Japanese seiyū, JP |
|
|
| 沢口ケイ Japanese AV idol, JP (b. 1980) |
|
|
| 瞳ケイ Japanese AV idol, JP (b. 1983) |
|