Plavac Mali is a cross between Zinfandel (yes, we believe Zin is native to Croatia and not Italy, although genetic differences also make a valid argument that is it native to California) and the ancient grape of Dobričić. Plavac Mali is in fact the grape most often planted on the Dalmati coast in Croatia.
Grapes are small and blue, which is where the name comes. In Croatian:
It is interesting to point out that before researchers at UC Davis started mapping genetic history of grapes, most people involved in the wine industry thought that Plavac Mali was a parent of Zinfandel. They were close, although they had the relationship reversed.