Family name Gunathilake (Gunathilake 
) , across the world, is a common cognomen. The last name Gunathilake is characteristic of Sri Lanka, where it is quite a common surname, Maldives, where it is quite a rare surname, and New Zealand. In absolute terms, it is the most numerous in Sri Lanka, New Zealand, and Indonesia. Much less frequently, Gunathilake is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Gunathilake | Australia, United Arab Emirates, Indonesia, New Zealand, Sri Lanka |
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kolitha gunathilake Sri Lankan air marshal |
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| angeline gunathilake Sri Lankan singer (1939-2019), LK (b. 1939) |
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| nandana gunathilake Sri Lankan politician, LK (b. 1962) |
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| roshan gunathilake researcher |
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| k d p p gunathilake researcher (ORCID 0000-0003-1965-0583) |
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| damitha gunathilake researcher |
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| chamila gunathilake researcher ORCID ID = 0000-0001-7912-3940 |
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| malith gunathilake cricketer, LK (b. 1987) |
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Mr, Ricky, Dammi, Dakum, Gayan, Nisal, Nimal, Nihal, Nuwan, Hansi, Rekha, Inoka, Oshan, Uresh, Udara, Upali, Malika, Mahesh, Mekulu, Mihiri, Miyuru, Isuru, Rohan, Ranga, Piumi, Sam, Anne, Karu, Ravi, Rust, Ryan, Upul, Mohan, Saman, Sunil, Senal, Aruna, Amila, Ashok, Asela, Ajith, Bashi, Kalum, Kamal, Kasun, Kelum, Sandil, and Sandun