Cognomen Mounphosay (Mounphosay 
) , around the world, is an extremely rare family name. The surname Mounphosay is habitual in Northern America, particularly Canada, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Mounphosay | Canada |
| bounpheng mounphosay Laotian politician (b. 1948) |
|