Cognomen พันธ์วงศา (พันธ์วงศา 
, Phanvongsa 
, Phunvongsa ) , globally, is a rare family name. The family name พันธ์วงศา is habitual in Laos, where it is quite a common surname, Thailand, where it is a rare surname, and Australia, where it is a very rare surname. Measured by absolute frequency, it is the most numerous in Laos, Thailand, and the United States.
| VARIANT | COUNTRY |
|---|---|
| Phunvongsa, พันธ์วงศา | Thailand |
| Phanvongsa | Laos, Australia, Thailand, United States, Canada |