Surname Portna (Portna 
) , across the world, is a very rare cognomen. The surname Portna is characteristic of Estonia, where it is a rare surname, Greece, where it is a very rare surname, and Canada, where it is an extremely rare surname. Not in comparison with a country's population, it most frequently occurs in Greece, Germany, and Estonia.
| VARIANT | COUNTRY |
|---|---|
| Portna | United States, Greece, Ukraine, Germany, Canada |