Cognomen ผดุงชัย (ผดุงชัย 
, Padungchai 
, Phadudchai ) , around the world, is a rare last name. The cognomen ผดุงชัย is habitual in Thailand, where it is a rare surname, Singapore, and the United States, where it is an extremely rare surname. Likewise, ผดุงชัย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Phadudchai, ผดุงชัย | Thailand |
| Padungchai | Thailand, United States, Singapore |