Surname Sungmoon (Sungmoon 
) , all over the world, is a very rare family name. The cognomen Sungmoon is characteristic of Thailand, where it is a very rare surname, and China, where it is an extremely rare surname. Much more prevalently, Sungmoon is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sungmoon | Thailand, South Korea, China, Greece, United States |