Cognomen 지수 (Jisoo 
, 지수 , Ji-Soo ) , around the world, is a rare family name. The cognomen 지수 is characteristic of South Korea, where it is quite a rare surname, Indonesia, where it is a very rare surname, and Japan. Measured by absolute frequency, the name is most common in South Korea, Indonesia, and China. Predominantly, 지수 is the forename as well as the last name.