Family name Petna (Petna 
) , in the world, is a very rare last name. The cognomen Petna is habitual in Thailand, where it is a very rare surname, India, where it is an extremely rare surname, and Russia. Likewise, Petna is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Petna | Tanzania, Thailand, Russia, United States, India |