Cognomen Jihoon (지훈 
, Jihoon 
) , all around the world, is quite a rare surname. The cognomen Jihoon is characteristic of South Korea, where it is quite a rare surname, Malaysia, where it is a very rare surname, and Japan. Measured by absolute frequency, it most frequently occurs in South Korea, China, and Indonesia. More frequently, Jihoon is the forename as well as the last name.