Cognomen Dumby (Dumby 
, Думби 
) , globally, is a rare family name. The surname Dumby is characteristic of Angola, where it is a rare surname, Russia, where it is a very rare surname, and South Africa, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Dumby | United Kingdom, South Africa, Angola, United States, Canada |
| Думби | Russia |