Family name Gashchuk (Gashchuk 
, Гащук 
) , worldwide, is a rare surname. The surname Gashchuk is characteristic of Ukraine, where it is quite a rare surname, Belarus, and Kazakhstan, where it is a rare surname. Not in comparison with a country's population, it is the most numerous in Eastern Europe, particularly Ukraine, Belarus, and Russia.
| VARIANT | COUNTRY |
|---|---|
| Gashchuk | Russia, Bulgaria |
| Гащук | Russia, Kazakhstan, Ukraine, Belarus |