Last name Kiyoon (Kiyoon 
) , throughout the world, is a very rare cognomen. The family name Kiyoon is characteristic of the United Kingdom, where it is an extremely rare surname, and China. Much more prevalently, Kiyoon is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kiyoon | South Korea, China, United Kingdom, United States, India |