Cognomen Vlka (Вълка 
, Vlka 
) , across the world, is quite a rare last name. The cognomen Vlka is characteristic of Bulgaria, where it is quite a common surname, and India, where it is an extremely rare surname. Likewise, Vlka is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Вълка | Bulgaria |
| Vlka | India |