Cognomen Rajaratnam (Rajaratnam 
, Раджаратнам 
) , around the globe, is a common family name. The family name Rajaratnam is characteristic of Sri Lanka, where it is quite a common surname, Malaysia, where it is quite a rare surname, and Mauritius. Not in comparison with a country's population, this name is the most popular in Sri Lanka, Malaysia, and India. Also, Rajaratnam is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Rajaratnam | Sri Lanka, United Kingdom, Canada, India, Malaysia |
| Раджаратнам | Ukraine |
Райаратнам, and ราชเทวี
| s. rajaratnam politician (1915-2006), SG (b. 1915) |
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| rajaratnam selvanayagam (b. 1921, d. 1999), MY (b. 1921) |
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| j. m. rajaratnam Sri Lankan Tamil accountant and corporate executive (1927-2014), LK (b. 1927) |
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| rajaratnam yogeswaran Malaysian hockey player, MY (b. 1940) |
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| raj rajaratnam American businessman, US (b. 1957) |
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| shantha m. w. rajaratnam psychologist and sleep researcher (b. 1970) |
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| thenmozhi rajaratnam Sri Lankan suicide bomber, IN (b. 1974) |
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| priya rajaratnam actress |
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| rajanathan rajaratnam researcher |
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| bala s rajaratnam researcher (ORCID 0000-0002-1382-7838) |
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| gowri rajaratnam Singapore entomologist, SG |
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| premraj rajaratnam researcher (ORCID 0000-0002-3788-5346) |
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| vilashini rajaratnam researcher (ORCID 0000-0003-4674-7874) |
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| bala s rajaratnam researcher ORCID 0000-0002-7236-6250 |
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| rajaratnam rameshshanker researcher |
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