Family name Demarki (Demarki 
) , worldwide, is a very rare last name. The cognomen Demarki is habitual in Croatia, where it is a rare surname, Austria, and Canada, where it is a very rare surname. Much less frequently, Demarki is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Demarki | Italy, Austria, Croatia, Canada, Brazil |