Cognomen Jayathilaka (Jayathilaka 
) , around the world, is a common last name. The last name Jayathilaka is habitual in Sri Lanka, where it is a common surname, Qatar, where it is quite a rare surname, and United Arab Emirates. Measured by absolute frequency, it is commonest in Sri Lanka, United Arab Emirates, and Indonesia. Much less frequently, Jayathilaka is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Jayathilaka | Indonesia, Qatar, Saudi Arabia, United Arab Emirates, Sri Lanka |
| nimanthi jayathilaka researcher (ORCID 0000-0001-8741-3075) |
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| ruwan jayathilaka researcher |
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| milan jayathilaka Sri Lankan politician and Member of Parliament (b. 1981) |
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Mr, Amila, Ashan, Asela, Asoka, Akila, Ajith, Kamal, Kasun, Pasan, Ranga, Rahal, Rosan, Rohan, Ruwan, Dasun, Dilan, Dilum, Gayan, Gihan, Amali, Aruni, Aruna, Anoma, Ms, Sam, Anu, Don, Amal, Ravi, Jaya, Tina, Neel, Nalin, Upul, Mahen, Sanju, Saman, Sadun, Suraj, Suran, Sunil, Supun, Anura, Manoj, and Nisal