Family name พัทธวงศ์ (พัทธวงศ์ 
, Phattavong 
) , across the world, is a very rare last name. The surname พัทธวงศ์ is habitual in Thailand, where it is a very rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| พัทธวงศ์ | Thailand |
| Phattavong | United States |