Cognomen Портоян (Портоян 
, Portoian 
) , around the world, is a very rare last name. The surname Портоян is characteristic of Georgia, where it is a rare surname, Russia, where it is a very rare surname, and Ukraine, where it is an extremely rare surname. Measured by absolute frequency, it is commonest in Russia, Georgia, and the United States. Likewise, Портоян is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Портоян | Russia, Ukraine, Armenia |
| Portoian | United States, Georgia |