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my girlfriend's family (called Rzanicanin), who have lived in Sumadija in southern Serbia for the last century and a half, claim originally to have come from Rzanica in southeast Montenegro and to have been Vasojevici (the family name was Calic at that time).
Anyway, if you know absolutely nothing about the Vasojevici, you will find a few snippets in "The National Question in Yugoslavia: Origins, History and Politics" by Ivo Banac (Cornell Universiy Press, Ithaca and London, 1984), including a map on p 273 which shows the clan's original territory (and an amusing suggestion, on p295, that the clan were originally Albanian). There are a couple of brief references to them in "Kosovo: a Short History" by Noel Malcolm (Macmillan, London, 1998).