Family name Poddubnaja (Поддубная 
, Poddubnaja 
) , throughout the world, is quite a common last name. The cognomen Poddubnaja is habitual in Latvia, where it is quite a rare surname, Russia, and Belarus. Not in comparison with a country's population, it is the most numerous in Russia, Kazakhstan, and Belarus.
| VARIANT | COUNTRY |
|---|---|
| Поддубная | Kazakhstan, Belarus, Kyrgyzstan, Azerbaijan, Russia |
| Poddubnaja | Estonia, Lithuania, Latvia, Belarus |