Family name Rajarathnam (Rajarathnam 
) , throughout the world, is quite a rare cognomen. The cognomen Rajarathnam is habitual in Sri Lanka, where it is quite a rare surname, Singapore, and Malaysia, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Sri Lanka, India, and Malaysia. Likewise, Rajarathnam is the forename as well as the last name.
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| Rajarathnam | South Africa, Malaysia, India, Sri Lanka, Singapore |
| g. p. rajarathnam Indian writer, IN (b. 1909) |
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| f. m. rajarathnam Indian politician, IN |
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| krishna rajarathnam researcher |
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| rajarathnam chandramouli Ph.D. University of South Florida 1999 |
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