Throughout the world, Rajarathnam (Rajarathnam 
) is a rare largely masculine, but uncommonly feminine first name. The given name Rajarathnam is characteristic of Southern Asia, particularly India, where it is a very rare dominantly boy's, but uncommonly girly name. Also, Rajarathnam is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Rajarathnam | South Africa, Singapore, India, Sri Lanka, Malaysia |
| allu rajarathnam Indian theologian, IN (b. 1941) |
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| kumar rajarathnam Indian Judge (1942-2015) (b. 1942) |
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| dharmarajan rajarathnam researcher, ORCID id # 0000-0001-6863-5510 |
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