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, India, United States, Mongolia, Myanmar |
| Kaye, Keye | Malaysia, India, United States, Myanmar, United Kingdom |
| Kei | Japan, India, United States, Mongolia, Myanmar |
| ケイ | Japan |
| 前田ケイ JP (b. 1931) |
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| 遠藤ケイ Japanese illustrator, JP (b. 1944) |
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| 真梨邑ケイ Japanese jazz singer, idol and pornographic actress, JP (b. 1957) |
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| 石黒ケイ Japanese actress, JP (b. 1958) |
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| 小泉ケイ Japanese AV idol, JP (b. 1967) |
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| ナガセケイ Japanese actor, JP (b. 1968) |
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| 水谷ケイ Japanese adult video actress, JP (b. 1974) |
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| 佐藤ケイ Japanese novelist, JP (b. 1976) |
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| 平松ケイ Japanese AV idol, JP (b. 1976) |
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| 神楽坂ケイ Japanese AV idol, JP (b. 1977) |
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| 池上ケイ Japanese singer-songwriter, JP (b. 1979) |
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| 富樫ケイ Japanese seiyū, JP |
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| 草村ケイ Japanese seiyū, JP |
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| 沢口ケイ Japanese AV idol, JP (b. 1980) |
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| 瞳ケイ Japanese AV idol, JP (b. 1983) |
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