Last name Pirnstill (Pirnstill 
) , around the globe, is a very rare surname. The cognomen Pirnstill is habitual in Switzerland, where it is a very rare surname, Germany, and the United States, where it is an extremely rare surname. Much less frequently, Pirnstill is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Pirnstill | Switzerland, Germany, United States |