Family name Popovnin (Popovnin 
, Поповнин 
) , globally, is a rare cognomen. The family name Popovnin is habitual in Russia, where it is a rare surname, and Kazakhstan, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Popovnin | Russia |
| Поповнин | Kazakhstan, Russia |