Cognomen Demkovic (Demkovic 
) , across the world, is a very rare family name. The cognomen Demkovic is habitual in Slovakia, where it is a rare surname, Canada, where it is a very rare surname, and France, where it is an extremely rare surname. In absolute terms, it most frequently occurs in Slovakia, the United States, and Canada.
| VARIANT | COUNTRY |
|---|---|
| Demkovic | United States, France, Slovakia, Canada |