Surname Pemarathna (Pemarathna 
) , throughout the world, is a rare cognomen. The last name Pemarathna is characteristic of Sri Lanka, where it is quite a rare surname, and Canada, where it is an extremely rare surname. Very seldom, Pemarathna is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Pemarathna | Canada, Sri Lanka |