Surname Petnapa (Petnapa 
) , throughout the world, is an extremely rare cognomen. Much more frequently, Petnapa is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Petnapa | United States, Thailand |
Yowngbubpha, Sunawat, Sopajon, Kaikaew, Saiduang, Stirattiphan, Peterson, Thavornun, Srirattiphan, Petcharat, and Jarearnying