Family name Oryshchak (Oryshchak 
, Орищак , Орыщак ) , around the globe, is a rare surname. The cognomen Oryshchak is habitual in Ukraine, where it is quite a rare surname, Afghanistan, where it is a rare surname, and Poland, where it is a very rare surname. Measured by absolute frequency, it is commonest in Ukraine, Afghanistan, and Russia.