Cognomen วาทศิลป์ (วาทศิลป์ 
, Vatasin 
, Rhetorical 
) , worldwide, is a very rare last name. The surname วาทศิลป์ is habitual in Thailand, where it is a very rare surname, Israel, and the United States, where it is an extremely rare surname. More prevalently, วาทศิลป์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| วาทศิลป์ | Thailand |
| Vatasin | India, United States, Thailand |
| Rhetorical | Israel, United States |