Family name พนัก (Phanak 
, พนัก ) , all around the world, is a rare last name. The surname พนัก is characteristic of Laos, where it is quite a common surname, Thailand, where it is a rare surname, and Switzerland. Very seldom, พนัก is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Phanak | Laos, Switzerland, Cambodia, Thailand, India |
| พนัก | Thailand |