Cognomen 柯斯 (柯斯 
, Kills 
) , across the world, is a rare surname. The family name 柯斯 is characteristic of Indonesia, where it is a very rare surname, the United States, where it is an extremely rare surname, and France. Measured by absolute frequency, it is commonest in Indonesia, the United States, and China. Also, 柯斯 is the forename as well as the last name.