Family name Rajakaruna (Rajakaruna 
) , worldwide, is a common surname. The last name Rajakaruna is characteristic of Sri Lanka, where it is quite a common surname, Qatar, where it is quite a rare surname, and Kuwait. Measured by absolute frequency, it is the most numerous in Sri Lanka, Australia, and United Arab Emirates. Very seldom, Rajakaruna is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Rajakaruna | Australia, Qatar, Saudi Arabia, Sri Lanka, United Arab Emirates |
| upali rajakaruna Sri Lankan wheelchair tennis player, LK (b. 1975) |
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| harshana rajakaruna Sri Lankan politician, LK (b. 1980) |
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| n. rajakaruna researcher |
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| harshana rajakaruna Ph.D. University of Alberta 2013 |
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| rupika s rajakaruna researcher (ORCID 0000-0001-7939-947X) |
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| nishanta rajakaruna US botanist |
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| denuwan rajakaruna cricketer, LK (b. 1990) |
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| rupika s. rajakaruna |
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Mr, Anura, Anoma, Aruna, Amali, Amila, Amith, Ashan, Asela, Akila, Srima, Aveen, Bimal, Kamal, Kasun, Kavin, Kelum, Keith, Kevin, Kumar, Ranga, Ajith, Rahul, Supun, Suren, Raj, Lal, Mano, Mali, Amal, Ravi, Rupa, Ryan, Loku, Susil, Navi, Hely, Hewa, Upul, Manoj, Manel, Mohan, Saman, Sahan, Silky, Eric, and Rohan