Surname Karunarathna (Karunarathna 
) , worldwide, is a common family name. The last name Karunarathna is habitual in Sri Lanka, where it is a common surname, Maldives, where it is quite a common surname, and Qatar, where it is quite a rare surname. Measured by absolute frequency, it is commonest in Sri Lanka, United Arab Emirates, and Saudi Arabia. Much less frequently, Karunarathna is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Karunarathna | United Arab Emirates, Saudi Arabia, Bangladesh, Sri Lanka, Indonesia |
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karunarathna divulgane Sri Lankan musician and politician |
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| anuruddha karunarathna Thai mycologist, TH |
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| mathisha karunarathna biologist |
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| d.m.s. suranjan karunarathna Sri Lankan field biologist conducting research on herpetofaunal taxonomy and ecology, LK |
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| samantha karunarathna botanist |
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| samantha c. karunarathna researcher |
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| thilini karunarathna researcher (ORCID 0000-0002-2742-4773) |
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| mudugamuwe hewawasam jayan savinda karunarathna researcher (ORCID 0000-0002-2805-0806) |
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| thissa karunarathna researcher |
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| harshinie karunarathna British coastal and estuarine engineer, GB |
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| karunarathna kulasekera Ph.D. University of Nebraska-Lincoln 1988 |
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| nuwan karunarathna |
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