Family name Dayarathna (Dayarathna 
) , throughout the world, is quite a common last name. The family name Dayarathna is habitual in Sri Lanka, where it is quite a common surname, Qatar, where it is a rare surname, and United Arab Emirates. Measured by absolute frequency, it is commonest in Sri Lanka, Indonesia, and United Arab Emirates. Very seldom, Dayarathna is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Dayarathna | United Arab Emirates, Sri Lanka, Qatar, Indonesia, Saudi Arabia |
| dayarathna ranatunga musical artist (b. 1940) |
|
|
| waruna lakshanb dayarathna (b. 1988) |
|
Daya, Rajith, Roshan, Rumesh, Damith, Dinesh, Dinuka, Dishan, Dushar, Gamini, Lakmal, Jayami, Thilak, Nalaka, Eranga, Harsha, Vianca, Indika, Ishara, Uditha, Sanjaya, Sampath, Pubudu, Sameera, Asanka, Sureka, Upul, Saman, Sunil, Amila, Ashok, Kasun, Kelum, Ranga, Rohan, Gayan, Namal, Nalan, Nalin, Nimal, Nuwan, Isuru, Udara, Udesh, Menaka, Sarath, Suraji, Anjali, and Sasitha