Cognomen Tjoa (Tjoa 
) , globally, is a common family name. The family name Tjoa is habitual in Indonesia, where it is quite a rare surname, Singapore, and Netherlands, where it is a rare surname. Measured by absolute frequency, this name is the most popular in Indonesia, the United States, and Netherlands. Very seldom, Tjoa is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Tjoa | Australia, Singapore, United States, Netherlands, Indonesia |
| tjoa tjoe koan Chinese Indonesian journalist and publisher, ID (b. 1861) |
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| tjoa sie lian NL (b. 1903) |
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| tjoa tek swat ID (b. 1911) |
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| johnny tjoa badminton player, ID (b. 1930) |
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| tjoa keng loan Indonesian singer, ID (b. 1931) |
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nadia tjoa Indonesian model, ID (b. 1994) |
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| twie giok tjoa NL (b. 1943) |
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| tjoson tjoa researcher (ORCID 0000-0001-8777-4145) |
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| aiyen tjoa researcher |
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| a min tjoa researcher, ORCID id # 0000-0002-8295-9252 |
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| iauw bhieng fredricus tjoa Ph.D. Carnegie Mellon University 1991 |
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| twie tjoa |
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| tjoa sioe sin |
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| tjoa tjoen kiat |
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| tjoa giok tjiam |
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