Surname Sivarajan (Sivarajan 
) , in the world, is quite a rare last name. The surname Sivarajan is characteristic of United Arab Emirates, where it is quite a rare surname, Bahrain, and Malaysia. Not in comparison with a country's population, it is commonest in India, Malaysia, and United Arab Emirates. More frequently, Sivarajan is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Sivarajan | United Arab Emirates, Malaysia, India, United States, Saudi Arabia |
| v. v. sivarajan botanist (1944-1995), IN (b. 1944) |
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| sajeevan radha sivarajan researcher ORCID ID = 0000-0002-8671-4981 |
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| sharmila sivarajan researcher (ORCID 0000-0001-8171-6358) |
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Siva, Rajadurai, Rajendran, Gunarajan, Thiruvadi, Natarajan, Nagamuthu, Seenivasan, Adikesavan, Kathirasan, Rajagopal, Kumarasamy, Navaratnam, Velupillai, Sarangabani, Subramanian, Subramaniam, Gunasekaran, Ramachandran, Varatharajan, Gopalakrishnan, Jaganathan, Chettiyar, Sakthivel, Nadaraja, Nair, Sekar, Asari, Balan, Pilla, Rajan, Nayar, Achari, Pillai, P R Gunarajan, Kesavan, Ponniah, Gopalan, Vijayan, Iyappan, Annamaly, Arumugam, Kuppa Rajoo, Krishnan, Ramasamy, Raghavan, Sivasubramaniam, and Vigneswararajah