Cognomen Ramasubbu (Ramasubbu 
) , around the globe, is a rare last name. The cognomen Ramasubbu is habitual in Sri Lanka, where it is quite a rare surname, United Arab Emirates, where it is a rare surname, and Oman. In absolute terms, it most frequently occurs in India, Sri Lanka, and Australia. Much less frequently, Ramasubbu is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Ramasubbu | Australia, United Arab Emirates, India, United States, Sri Lanka |
| k. ramasubbu Indian politician, IN (b. 1911) |
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| s. s. ramasubbu Indian politician, Former Member of the Legislative Assembly, IN (b. 1950) |
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| narayan ramasubbu researcher ORCID ID = 0000-0002-6959-0729 |
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| ramasubbu sankararamakrishnan researcher |
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| s. ramasubbu Indian politician, IN |
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| rajamannar ramasubbu researcher (ORCID 0000-0002-7463-5047) |
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| r. ramasubbu botanist |
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