Cognomen Kosiuga (Косюга 
, Kosiuga 
) , in the world, is quite a rare last name. The family name Kosiuga is characteristic of Ukraine, where it is quite a rare surname, Russia, where it is a rare surname, and Kazakhstan, where it is a very rare surname. Measured by absolute frequency, the name is most common in Ukraine, Russia, and the United States. Much less frequently, Kosiuga is the forename as well as the last name.