Cognomen Trịnh (Trinh 
, Trịnh 
, チン 
) , in the entire world, is a widespread family name. The cognomen Trịnh is habitual in Vietnam, where it is quite a common surname, Macao, and Australia, where it is quite a rare surname. Measured by absolute frequency, it is the most numerous in Vietnam, the United States, and Australia. Likewise, Trịnh is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Trinh | Malaysia, Australia, Canada, United States, Vietnam |
| Trịnh | France, Australia, Canada, United States, Vietnam |
| チン | Japan |
| Чинь | Russia, Ukraine, Kazakhstan, Belarus |
| trịnh thị tuyên (b. 1471) |
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| trịnh xuân (b. 1550) |
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| trịnh thị ngọc lung (b. 1612) |
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| trịnh kiều (b. 1650) |
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| trịnh thất (1760-1802), VN (b. 1760) |
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| trịnh hoài đức Nguyen dynasty politician and writer, 1765-1825 (b. 1765) |
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trịnh đình thảo VN (b. 1902) |
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giuse maria trịnh văn căn Vietnamese cardinal, VN (b. 1921) |
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giuse trịnh chính trực Vietnamese Roman Catholic bishop, VN (b. 1925) |
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| giuse maria trịnh như khuê Vietnamese cardinal, VN (b. 1898) |
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trịnh xuân thuận American astronomer, VN (b. 1948) |
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trịnh hữu châu Vietnamese-American astronaut, VN (b. 1950) |
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trịnh bửu hoài poet, VN (b. 1952) |
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trịnh thị minh hà Vietnamese-US American post-colonial difference theorist, composer and filmmaker, VN (b. 1952) |
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| trịnh thịnh Vietnamese actor, VN (b. 1926) |
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