Family name Thiruchelvam (Thiruchelvam 
) , throughout the world, is quite a rare last name. The surname Thiruchelvam is characteristic of Sri Lanka, where it is quite a rare surname, Malaysia, and Singapore, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Sri Lanka, Malaysia, and the United Kingdom. Likewise, Thiruchelvam is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Thiruchelvam | Canada, Malaysia, Australia, Sri Lanka, United Kingdom |
| timothy thiruchelvam researcher |
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| kaeshaelya thiruchelvam researcher |
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| nikesh thiruchelvam researcher (ORCID 0000-0002-2910-2209) |
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| murugan thiruchelvam British chess player, GB (b. 1989) |
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