Surname Peregnyak (Peregnyak 
, Перегняк 
) , all around the world, is a rare cognomen. The cognomen Peregnyak is habitual in Eastern Europe, particularly Ukraine, where it is a rare surname, Belarus, and Russia, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Peregnyak | Russia, Ukraine |
| Перегняк | Ukraine, Belarus, Russia |