Last name Cai (Cai 
, 蔡 , Цай 
) , in the world, is a prevalent family name. The cognomen Cai is habitual in China, where it is a common surname, Cayman Islands, and British Virgin Islands (explore the name in all countries). Not in comparison with a country's population, the name is most common in China, the United States, and Hong Kong.
| VARIANT | COUNTRY |
|---|---|
| Cai | China, Indonesia, Hong Kong, United States, Singapore |
| 蔡 | China |
| Цай | Kazakhstan, Ukraine, Kyrgyzstan, Russia, Uzbekistan |
| קאי | Israel |
Caì, Caí, Caï, Chai, Chi, Chih, Choi, Choy, Chua, Chuah, Chê, Cài, Càí, Cái, Cáí, Câì, Cãi, Cāi, Cǎi, Cại, Cải, Kaai, Kade, Qi, Sái, Sī, Thái, Tsai, Tsoi, Tề, Čai, Гай, Цаи, Ци, צ'י, צאי, تساي, كاي, چای, চাই, சாய், แซ่ฉั่ว, စဲ, စ်ဲ, ចៃ, ជៃ, カイ, チー, ㄘㄞ, 倸, 偲, 啋, 埰, 婇, 寀, 彩, 才, 採, 斉, 材, 棌, 毝, 溨, 猜, 睬, 綵, 縩, 纔, 菜, 蔡氏, 裁, 財, 财, 跴, 踩, 采, 齊, 齐, 제, 채, Ｃàī, Ｃái, Ｃāī, and Ｃａｉ
| lady cai Chinese noble (b. 150) |
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| bo cai rebel (b. 200) |
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| cai mo China person CBDB = 12005 (b. 281) |
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| cai kuo Liu Song dynasty person CBDB = 12009 (b. 379) |
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| cai xingzong Liu Song official (b. 415) |
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| cai yue Southern Qi person CBDB = 12011 (b. 457) |
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| cai meiren (b. 450) |
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| cai zun Southern Qi person CBDB = 12012 (b. 467) |
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| cai jun Eastern Wei military commander (b. 495) |
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| zhang cai Tang dynasty person CBDB = 139095 (b. 581) |
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| cai junchang Tang dynasty person CBDB = 139695 (b. 582) |
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| wang cai Tang dynasty person CBDB = 138847 (b. 582) |
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| zhang cai Tang dynasty person CBDB = 139047 (b. 588) |
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| wang cai Tang dynasty person CBDB = 139020 (b. 592) |
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| wang cai Tang dynasty person CBDB = 139417 (b. 594) |
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