Surname Grmaca (Grmaca 
) , globally, is a very rare cognomen. The family name Grmaca is habitual in Switzerland, where it is a rare surname, Croatia, where it is a very rare surname, and Germany. Very seldom, Grmaca is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Grmaca | Germany, Switzerland, Croatia, United States |