Family name Kwangsuk (Kwangsuk 
) , throughout the world, is a very rare cognomen. The last name Kwangsuk is habitual in Thailand, where it is an extremely rare surname, China, and the United States. In absolute terms, this name is the most popular in China, Thailand, and India. Much more prevalently, Kwangsuk is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kwangsuk | Thailand, South Korea, United States, India, China |