Cognomen Gunathilaka (Gunathilaka 
) , in the world, is a common surname. The surname Gunathilaka is characteristic of Sri Lanka, where it is a common surname, Qatar, where it is quite a rare surname, and United Arab Emirates.
| VARIANT | COUNTRY |
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| Gunathilaka | United Arab Emirates, Kuwait, Saudi Arabia, Sri Lanka, Qatar |
| gunathilaka rajapaksha Sri Lankan politician (b. 1957) |
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| channa gunathilaka Sri Lankan general (b. 1963) |
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| thilina l gunathilaka researcher |
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| nayana gunathilaka researcher |
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Mr, Ayesh, Ajith, Berty, Kalpa, Kamal, Kasun, Kelum, Pasan, Piyum, Ranil, Rohan, Ridma, Ruwan, Dayan, Dasun, Dilan, Dilum, Dulip, Gayan, Akila, Asoka, Asela, Asith, Ms, Anu, Don, Ravi, Leel, Manoj, Malki, Miuru, Sanka, Gehan, Saman, Sunil, Supun, Anura, Anoma, Aruna, Amila, Amith, Ashan, Asiri, Sahan, and Gihan