Last name Tomashuk (Tomashuk 
, Томашук 
) , across the world, is quite a rare cognomen. The family name Tomashuk is habitual in Eastern Europe, particularly Belarus, where it is quite a rare surname, Ukraine, and Czechia, where it is a rare surname. Not in comparison with a country's population, it most frequently occurs in Eastern Europe, particularly Ukraine, Russia, and Belarus.
| VARIANT | COUNTRY |
|---|---|
| Tomashuk | Russia, Bulgaria, United States, Belarus, Czechia |
| Томашук | Belarus, Russia, Ukraine, Kazakhstan |