Family name Posil (Posil 
) , around the world, is a very rare surname. The family name Posil is habitual in Thailand, where it is a very rare surname, Malaysia, where it is an extremely rare surname, and the United States. Very seldom, Posil is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Posil | India, Malaysia, United States, Thailand |