Family name Kaioun (Каюн 
, Kaioun 
) , around the world, is a rare surname. The last name Kaioun is characteristic of Ukraine, where it is quite a rare surname, Kyrgyzstan, where it is a rare surname, and Belarus. Not in comparison with a country's population, it most frequently occurs in Ukraine, Russia, and France. Much less frequently, Kaioun is the forename as well as the last name.