Family name Rajarajan (Rajarajan 
) , all around the world, is a rare surname. The surname Rajarajan is habitual in United Arab Emirates, where it is a rare surname, Singapore, and Australia. Measured by absolute frequency, this name is the most popular in India, Australia, and United Arab Emirates. More frequently, Rajarajan is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Rajarajan | Australia, United Arab Emirates, United States, India, Saudi Arabia |
| r. r. rajarajan (b. 1957) |
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| prashanth rajarajan researcher (ORCID 0000-0002-1240-6716) |
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| araiyan rajarajan Commander of the Chola army |
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| r. k. kesava rajarajan (b. 1973) |
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| jeyapriya rajarajan (b. 1978) |
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| karan rajan rajarajan badminton player, IN (b. 1996) |
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Raj, Ramaswamy, Rajagopal, Rajendran, Natarajan, Nagarajan, Mahalingam, Sendurpandian, Ramalingam, Tarmalinggam, Thangavelu, Venkatesan, Muthukkannan, Subramanian, Seetharaman, Arunachalam, Ramakrishnan, Ramachandran, Varadharajan, Veerapandian, Kuppusamy, Thirumavalavan, Murugasan, Valvilori, Anbu, Raja, Mohan, Sekar, Rajan, Kannan, Kamban, Gandhi, Wessel, Sivaraj, Pandian, Palaiah, Ganesan, Manickam, Murugiah, Sundaram, Arumugam, Ramadoss, Rajamani, Manoharan, and Balasubramanian