Family name Шастак (Shastak 
, Шастак 
) , throughout the world, is a rare cognomen. The surname Шастак is characteristic of Belarus, where it is a rare surname, Lithuania, and Russia, where it is a very rare surname. Very seldom, Шастак is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Shastak | United States, Lithuania, Latvia, Belarus |
| Шастак | Russia, Ukraine, Belarus |