Cognomen Phanthoulack (Phanthoulack 
) , in all the world, is quite a rare last name. The surname Phanthoulack is habitual in South-eastern Asia, particularly Laos, where it is quite a common surname, and Thailand, where it is a very rare surname. Much less frequently, Phanthoulack is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Phanthoulack | Laos, Thailand |