Surname Kusai (Kusai 
, קוסאי 
, Кусай 
) , around the world, is a rare last name. The surname Kusai is characteristic of Malaysia, where it is a rare surname, Hungary, and Ukraine, where it is a very rare surname. Measured by absolute frequency, it is commonest in Malaysia, Indonesia, and India. More prevalently, Kusai is the forename as well as the last name.