Last name Syshchuk (Сыщук 
, Syshchuk 
, Сищук ) , all around the world, is a rare surname. The cognomen Syshchuk is characteristic of Eastern Europe, particularly Ukraine, where it is a rare surname, Russia, and Bulgaria. In absolute terms, it is the most numerous in Ukraine, Russia, and Kazakhstan. Very seldom, Syshchuk is the forename as well as the last name.