Family name Kirša (Кирша 
, Kirša 
) , globally, is a rare surname. The surname Kirša is characteristic of Croatia, where it is quite a rare surname, Belarus, where it is a rare surname, and Ukraine, where it is a very rare surname. Not in comparison with a country's population, the name is most common in Russia, Croatia, and Belarus. Very seldom, Kirša is the forename as well as the last name.