All over the world, Siddharthan (Siddharthan 
) is a rare predominantly masculine, but scarcely female forename. The forename Siddharthan is habitual in Southern Asia, particularly India, where it is an extremely rare predominantly boy's, but very infrequently feminine name. Also, Siddharthan is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Siddharthan | United Kingdom, Malaysia, Singapore, United States, India |
| natteri s. siddharthan (b. 1945) |
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| siddharthan chandran regenerative neurologist |
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| ragavan v siddharthan researcher (ORCID 0000-0002-5661-9414) |
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| siddharthan deepti researcher |
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| siddharthan surveswaran |
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