Cognomen Ratnam (Ratnam 
) , throughout the world, is a common surname. The last name Ratnam is characteristic of Fiji, where it is quite a common surname, Sri Lanka, and Malaysia. In absolute terms, it most frequently occurs in India, Malaysia, and Sri Lanka. Likewise, Ratnam is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ratnam | Sri Lanka, Australia, United Arab Emirates, India, Malaysia |
|
mani ratnam Indian film director, IN (b. 1956) |
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ratnam v. raja kumar Indian academic, IN (b. 1958) |
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| daisy leela gopal ratnam (b. 1916) |
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samantha ratnam Australian politician (1977-), AU (b. 1977) |
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| shan ratnam Singaporean medical academic, MY (b. 1928) |
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| m. v. ram kumar ratnam (b. 1956) |
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| wickneswari ratnam researcher ORCID ID = 0000-0002-2085-6434 |
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| joseline ratnam researcher |
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| ponmalar ratnam Ph.D. University of Wisconsin-Milwaukee 2020 |
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| jayashree ratnam researcher |
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| ratnam ratnaseelan Ph.D. University of Missouri - Columbia 1996 |
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| j.v. ratnam researcher ORCID ID = 0000-0003-1385-2213 |
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| ashutosh ratnam researcher (ORCID 0000-0003-2308-8765) |
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| ratnam kanagaratnam researcher |
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| manohar ratnam researcher (ORCID 0000-0002-2866-7136) |
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