Surname 柯卡 (Kirka 
, 柯卡 
, Kolkka 
) , all around the world, is quite a rare last name. The surname 柯卡 is characteristic of Finland, where it is quite a rare surname, Slovakia, and Lithuania. Measured by absolute frequency, it is the most numerous in Finland, Turkey, and Slovakia. Very seldom, 柯卡 is the forename as well as the last name.