Cognomen Poustilnik (Poustilnik 
, Пустильник 
) , worldwide, is a rare surname. The last name Poustilnik is characteristic of Eastern Europe, particularly Ukraine, where it is a rare surname, Belarus, and Russia, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Poustilnik | France, Canada, United Kingdom, United States |
| Пустильник | Belarus, Russia, Ukraine |
Поустилник, and Пустилник
| simona poustilnik Russian scientist (b. 1961) |
|