Family name Tsai (蔡 
, Tsai 
, Цай 
, among others...) , all over the world, is a prevalent surname. The last name Tsai is habitual in China, where it is a common surname, Taiwan, and Cayman Islands (explore the name in all countries). Measured by absolute frequency, it is the most numerous in China, Taiwan, and the United States.
| VARIANT | COUNTRY |
|---|---|
| 蔡 | China |
| Tsai | Indonesia, Taiwan, China, Hong Kong, United States |
| Цай | Ukraine, Russia, Kyrgyzstan, Uzbekistan, Kazakhstan |
| ツァイ | Japan |
| Цаи | Kazakhstan, Russia |
| Тсаи | Russia |
| tsai ting-nan Qing dynasty politician from Penghu (b. 1801) |
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tsai ting kan Republican China politician (b. 1861) |
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wen-ying tsai American artist, US (b. 1928) |
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tsai hsun-hsiung Taiwanese politician (b. 1941) |
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| tsai shengbai Chinese businessman (b. 1894) |
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| christiana tsai (b. 1890) |
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tsai ming-liang Taiwanese filmmaker, MY (b. 1957) |
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| tsai fuh-tsu (b. 1902) |
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joseph tsai businessman, CA (b. 1964) |
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| tsai horng chung painter, MY (b. 1915) |
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francis tsai artist, US (b. 1967) |
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| wei-ping tsai (b. 1911) |
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james c. tsai (b. 1963) |
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janel tsai Taiwanese actress and fashion model (b. 1975) |
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| stephen w. tsai academic, US (b. 1929) |
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