Family name โคสุวรรณ (Koswan 
, โคสุวรรณ 
) , all over the world, is a rare last name. The surname โคสุวรรณ is characteristic of Thailand, where it is a rare surname, Canada, where it is a very rare surname, and the United States, where it is an extremely rare surname. Much less frequently, โคสุวรรณ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Koswan | United States, Myanmar, Canada, Spain |
| โคสุวรรณ | Thailand |