Surname Portnaia (Портная 
, Portnaia 
) , in the world, is quite a rare family name. The family name Portnaia is habitual in Russia, where it is a rare surname, Kazakhstan, and Belarus. Not in comparison with a country's population, it is the most numerous in Russia, Kazakhstan, and Ukraine. Much less frequently, Portnaia is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Портная | Kazakhstan, Ukraine, Russia, Belarus |
| Portnaia | Georgia, Germany, United States, Russia |