Cognomen Ragunathan (Ragunathan 
) , worldwide, is quite a rare surname. The cognomen Ragunathan is habitual in Sri Lanka, where it is quite a common surname, Malaysia, where it is quite a rare surname, and United Arab Emirates, where it is a rare surname. In absolute terms, the name is most common in Sri Lanka, Malaysia, and India. Very seldom, Ragunathan is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Ragunathan | United Kingdom, Sri Lanka, Malaysia, United States, India |
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sudha ragunathan Indian Carnatic singer, IN (b. 1968) |
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| ragunathan rajkumar professor of electrical and computer engineering at Carnegie Mellon University, US (b. 1963) |
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| preethi ragunathan researcher |
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| ragunathan priya researcher |
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| venkataraghavan ragunathan researcher |
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| v. ragunathan botanist |
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| latha ragunathan researcher |
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| sudarshan ragunathan researcher |
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