Cognomen Dearg (Dearg 
) , across the world, is an extremely rare family name. The surname Dearg is characteristic of Latin America and the Caribbean, particularly Chile, where it is an extremely rare surname. More frequently, Dearg is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Dearg | Chile, Ireland |
| lughaidh na riabh dearg Irish sovereign, IE |
|