Last name Ranatunga (Ranatunga 
) , across the world, is a common surname. The cognomen Ranatunga is characteristic of Sri Lanka, where it is quite a common surname, Qatar, where it is quite a rare surname, and United Arab Emirates. Not in comparison with a country's population, it is the most numerous in Sri Lanka, Australia, and United Arab Emirates. Much less frequently, Ranatunga is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Ranatunga | Australia, United Arab Emirates, United States, Indonesia, Sri Lanka |
| cyril ranatunga Sri Lankan military leader, LK (b. 1930) |
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| reggie ranatunga Sri Lankan politician (1937-2008), LK (b. 1937) |
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| amara ranatunga musical artist (b. 1939) |
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| k w ranatunga researcher |
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| r r m k p ranatunga researcher |
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| dhahara ranatunga collections manager at Auckland War Memorial Museum |
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| dhushantha ranatunga cricketer, LK (b. 1991) |
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| dulaj ranatunga Sri Lankan cricketer (b. 1999) |
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Mr, Sasha, Sunil, Supun, Senal, Sriya, Anura, Aruna, Arjun, Sahan, Amali, Asiri, Asela, Ajith, Conal, Bimal, Kalum, Kalpa, Kamal, Amila, Kasun, Saman, Mevan, Ms, Kim, Don, Nam, Mala, Sara, Subo, Asha, Sanka, Agit, Rane, Ravi, Daya, Tara, Nina, Nima, Neil, Eric, Rana, and Kelum