Family name Pilyak (Пиляк 
, Pilyak 
) , in all the world, is a rare cognomen. The surname Pilyak is characteristic of Eastern Europe, particularly Belarus, where it is quite a rare surname, Ukraine, where it is a rare surname, and Russia.
| VARIANT | COUNTRY |
|---|---|
| Пиляк | Belarus, Russia, Kazakhstan, Ukraine |
| Pilyak | Ukraine, Russia, United States, Belarus |