Family name Rajakumar (Rajakumar 
) , in the world, is a common surname. The cognomen Rajakumar is habitual in Sri Lanka, where it is quite a rare surname, Malaysia, and Bahrain. Measured by absolute frequency, it is commonest in India, Malaysia, and Sri Lanka. Much more frequently, Rajakumar is the forename as well as the last name.
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| Rajakumar | Malaysia, Saudi Arabia, Sri Lanka, India, United Arab Emirates |
| m. k. rajakumar Malaysian politician (1932-2008), MY (b. 1932) |
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| batulamai rajakumar Malaysian athletics competitor, MY (b. 1964) |
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| nagalingam rajakumar (b. 1957) |
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| rajakumar ramalingam researcher ORCID ID = 0000-0002-0734-3423 |
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| rajakumar balla researcher (ORCID 0000-0002-3344-5159) |
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| augustine rajakumar researcher |
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| s. rajakumar Indian politician, IN |
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| rajakumar ananthakrishnan researcher |
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| mohanalakshmi rajakumar author |
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| akila rajakumar researcher (ORCID 0000-0002-3279-7881) |
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| rajakumar vijaya raghunatha thondaiman Indian politician, IN |
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| anjith prakash rajakumar researcher |
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| rajendhran rajakumar researcher |
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| priscilla d rajakumar researcher (ORCID 0000-0002-8602-2897) |
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| sujeetha a rajakumar researcher |
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Sah, Yadav, Mandal, Manjhi, Mahato, Maurya, Mishra, Mistri, Sahani, Sharma, Bhagat, Pandit, Pandey, Paswan, Prasad, Thakur, Tivari, Mukhiya, Agraval, Chauhan, Pasavan, Ravidas, Varma, Tanti, Gupta, Rishi, Saw, Sih, Pal, Ram, Ray, Roy, Das, Jha, Saha, Sahu, Debbarma, Sada, Soni, Raut, Devi, Giri, Mahto, Majhi, Sahni, Singh, Patel, Rajak, Sinh, and Chaudhari