Surname Yongsook (Yongsook 
, ยงสุข 
) , across the world, is a very rare cognomen. The cognomen Yongsook is habitual in Thailand, where it is a very rare surname, Cambodia, and China, where it is an extremely rare surname. More frequently, Yongsook is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Yongsook | China, South Korea, Cambodia, United States, Canada |
| ยงสุข | Thailand |