Surname Hapai (Hapai 
, Хапай 
) , all over the world, is a very rare last name. The cognomen Hapai is characteristic of Kazakhstan, where it is a very rare surname, Russia, and Canada, where it is an extremely rare surname. Not in comparison with a country's population, the name is most common in Russia, the United States, and Kazakhstan. Likewise, Hapai is the forename as well as the last name.