Family name Synyak (Synyak 
, Синяк 
, Синиак ) , worldwide, is quite a rare surname. The last name Synyak is habitual in Belarus, where it is quite a common surname, Ukraine, where it is quite a rare surname, and Kazakhstan, where it is a rare surname. Not in comparison with a country's population, the name is most common in Eastern Europe, particularly Ukraine, Belarus, and Russia.