Cognomen Kiisu (Kis 
, Kies 
, Kiisu 
) , throughout the world, is a common surname. The family name Kiisu is habitual in Hungary, where it is a common surname, Serbia, where it is quite a common surname, and Slovakia (explore the name in all countries). Measured by absolute frequency, it is commonest in Hungary, Romania, and Serbia. Much less frequently, Kiisu is the forename as well as the last name.