Cognomen Kwangsoo (Kwangsoo 
) , across the world, is a rare family name. The surname Kwangsoo is habitual in South Korea, where it is a rare surname, Malaysia, where it is an extremely rare surname, and China. More frequently, Kwangsoo is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kwangsoo | Greece, South Korea, Canada, United States, China |