Family name Gai (Gay 
, Gai , Gaio , along with others...) , across the world, is a widespread cognomen. The surname Gai is habitual in Monaco, where it is quite a common surname, Gambia, and Barbados (explore the name in all countries). Measured by absolute frequency, it is commonest in China, the United States, and Myanmar. Much less frequently, Gai is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Gai, Gay, Gaio | China, Italy, France, United States, Myanmar |
| Гай | Kazakhstan, Ukraine, Belarus, Armenia, Russia |
| ガイ | Japan |
C., Caio, Caius, Cayo, Cayu, Cái, Dgai, Gaai, Gaius, Gaj, Gaja, Gajo, Gajus, Gallo, Galo, Gayar, Gayo, Gaí, Gaî, Gaï, Geai, Gài, Gái, Gãi, Gǎǐ, Jai, Jay, Kài, Vagus, Ɡǎǐ, Гайь, Гаюс, Кай, גאיוס, גיא, گای, ไก่, ဂဲ, ဂဲး, ဂ်ဲ, ㄍㄞ, 丐, 乢, 侅, 匄, 垓, 姟, 忋, 戤, 改, 改姓, 杚, 概, 槩, 槪, 溉, 漑, 瓂, 盖, 盖乌斯, 祴, 絠, 絯, 芥, 荄, 葢, 蓋, 該, 该, 豥, 賅, 賌, 赅, 郂, 鈣, 钙, 阣, 陔, 隑, and Ｇāī
| gai fan Tang dynasty person CBDB = 139595 (b. 589) |
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| gai shi daughter of Gai Lun (b. 603) |
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| gai ning Tang dynasty person CBDB = 146299 (b. 790) |
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| gai taisu Tang dynasty person CBDB = 145175 (b. 795) |
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| gai yu warlord (b. 801) |
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| gai shao Tang dynasty person CBDB=141943 (b. 817) |
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| gai shu Song dynasty person CBDB = 51096 (b. 1017) |
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| gai jing Song dynasty person CBDB = 19461 (b. 1129) |
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| gai guoshi Ming dynasty person CBDB = 207007 (b. 1551) |
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| solomon gai Italian scholar (b. 1600) |
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| gai fan Qing dynasty person CBDB = 89059 (b. 1619) |
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| antonio gai venetian sculptor (1686-1769), IT (b. 1686) |
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| gai fangmi Qing dynasty person CBDB = 89060 (b. 1768) |
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| gai qi Chinese artist and poet (1774-1829) (b. 1774) |
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francesco gai Italian painter, sculptor and architect (1835-1917), IT (b. 1835) |
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