Family name Jangsoo (Jangsoo 
) , in all the world, is a very rare cognomen. The family name Jangsoo is habitual in China, where it is an extremely rare surname, and the United States. Much more prevalently, Jangsoo is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Jangsoo | China, South Korea, United States, Canada, Brazil |