Surname Tjan (Tjan 
, تان 
, Тян 
) , in the world, is a common cognomen. The family name Tjan is habitual in Kazakhstan, where it is quite a common surname, Kyrgyzstan, where it is quite a rare surname, and Indonesia. Not in comparison with a country's population, it is commonest in Indonesia, Russia, and Kazakhstan. Also, Tjan is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Tjan | Singapore, Malaysia, United States, Indonesia, China |
| تان | Saudi Arabia, Iraq, Egypt, Sudan, Algeria |
| Тян | Kazakhstan, Uzbekistan, Russia, Kyrgyzstan, Ukraine |
| تجان | Iraq, Palestinian Territory |
| tjoe-som tjan Indonesian professor and translator, ID (b. 1903) |
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| tjan tjoe siem Indonesian writer, ID (b. 1909) |
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| harry tjan silalahi ID (b. 1934) |
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| tjan gobardhan (b. 1948) |
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| tjan so gwan Indonesian badminton player, ID (b. 1959) |
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| tjan bien nio Indies-born woman from a middle-class Peranakan Chinese family |
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| tjan lin eng Indonesian political candidate, ID |
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| tjan djoe sien photographer |
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| anastasia tjan researcher |
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| tjan agnes sugiarti Indonesian political candidate, ID |
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| yo kim tjan |
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| tjan bian nio |
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| giam nio tjan |
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