Family name Sundarrajan (Sundarrajan 
) , in the world, is quite a rare cognomen. The last name Sundarrajan is habitual in United Arab Emirates, where it is quite a rare surname, Singapore, where it is a rare surname, and Malaysia. Not in comparison with a country's population, it is commonest in India, United Arab Emirates, and the United States. Also, Sundarrajan is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Sundarrajan | United Arab Emirates, United States, India, Malaysia, China |
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r. sundarrajan Indian film director, IN (b. 1974) |
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| r. sundarrajan Indian politician, IN |
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| chandrasekhar sundarrajan researcher (ORCID 0000-0003-4955-228X) |
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| sundarrajan balachandar researcher (ORCID 0000-0002-4716-6046) |
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| aditya sundarrajan Ph.D. University of Massachusetts Amherst 2020 |
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| sudharsana sundarrajan researcher ORCID ID = 0000-0002-2828-0310 |
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