Last name Кусай (Kusai 
, Kusay 
, Kusaj 
) , all over the world, is quite a rare surname. The family name Кусай is habitual in North Macedonia, where it is a rare surname, Poland, and Malaysia. Not in comparison with a country's population, it is commonest in Poland, Malaysia, and Germany. More frequently, Кусай is the forename as well as the last name.