Surname ประเสริฐดำ (ประเสริฐดำ, Prasertdam 
, Praserthdam 
) , around the globe, is a rare cognomen. The cognomen ประเสริฐดำ is characteristic of Thailand, where it is a rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Prasertdam | Thailand |
| Praserthdam | United States |