Cognomen Nuwanthi (Nuwanthi 
) , globally, is a rare last name. The family name Nuwanthi is characteristic of Southern Asia, particularly Sri Lanka, where it is quite a rare surname. More prevalently, Nuwanthi is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Nuwanthi | Australia, United Kingdom, United States, Sri Lanka |