Cognomen Namarathne (Namarathne 
) , in all the world, is a rare surname. The cognomen Namarathne is habitual in Sri Lanka, where it is quite a rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Namarathne | United States, Sri Lanka |
Sudeera, and Dinithi Lakmali