Family name Yashchyshyn (Ящишин 
, Yashchyshyn 
) , worldwide, is quite a rare last name. The cognomen Yashchyshyn is characteristic of Ukraine, where it is quite a rare surname, Kazakhstan, where it is a rare surname, and Poland, where it is a very rare surname. Not in comparison with a country's population, it is commonest in Eastern Europe, particularly Ukraine, Russia, and Poland.