Globally, Ramarathnam (Ramarathnam 
) is a rare epicene first name. The first name Ramarathnam is habitual in Southern Asia, particularly India, where it is an extremely rare epicene name. Likewise, Ramarathnam is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Ramarathnam | India, United States, Canada, United Kingdom |
| ramarathnam narasimhan Indian mechanical engineer, IN (b. 1960) |
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| narasimhan ramarathnam Ph.D. California Institute of Technology 1986 |
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| ramarathnam venkatesan Ph.D. Boston University 1990 |
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| ramarathnam srinivasan |
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