Cognomen ริวรรณ (ริวรรณ 
) , in the world, is a very rare last name. The cognomen ริวรรณ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Also, ริวรรณ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| ริวรรณ | Thailand |