Cognomen Gunatilaka (Gunatilaka 
) , in all the world, is quite a rare family name. The cognomen Gunatilaka is habitual in Sri Lanka, where it is quite a common surname, Malaysia, where it is a rare surname, and Australia. Very seldom, Gunatilaka is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Gunatilaka | United Arab Emirates, Sri Lanka, Malaysia, Australia, Thailand |
| e. w. gunatilaka (b. 1864) |
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| chamindu c gunatilaka researcher |
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| leslie gunatilaka researcher |
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Mr, Nilan, Nimal, Isuru, Imesh, Umesh, Udesh, Mahesh, Madira, Migara, Tilak, Miyuru, Sanjay, Shanez, Seshan, Arosha, Ashlee, Asanka, Bimali, Kamron, Kumara, Sanath, Kusala, Tawan, Gihan, Ms, Roy, Madu, Miss, Addy, Gaya, Mervi, Saman, Sammy, Jasmy, Supun, Amara, Ashan, Aslam, Cecil, Kamal, Pasan, Ruwan, Derek, Dilok, Anura, and Pushpa