Family name Porthia (Porthia 
) , around the world, is an extremely rare surname. The surname Porthia is characteristic of Northern America, particularly the United States, where it is an extremely rare surname. Much more prevalently, Porthia is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Porthia | South Africa, Spain, Philippines, United States, Democratic Republic of the Congo |