Surname Siddharthan (Siddharthan 
) , all over the world, is a rare family name. The family name Siddharthan is characteristic of Singapore, where it is a rare surname, Malaysia, where it is a very rare surname, and India. Not in comparison with a country's population, this name is the most popular in India, the United States, and Malaysia. Likewise, Siddharthan is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Siddharthan | United Kingdom, Malaysia, Singapore, United States, India |
| raj siddharthan civil engineer (b. 1955) |
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| trishul siddharthan researcher |
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| advaith siddharthan researcher, ORCID 0000-0003-0796-8826 |
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| rahul siddharthan researcher (ORCID 0000-0002-2233-0954) |
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| venkatraman siddharthan |
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