Family name สว่างประเสริฐ (สว่างประเสริฐ, Sawangprasert 
) , around the globe, is a very rare last name. The surname สว่างประเสริฐ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Sawangprasert | Thailand |