Names from the former Yugoslavia

For those of you who know the language formerly known as Serbo-Croatian, are there particular surnames which tend to be "more Croatian", "more Bosnian" or "more Serbian", or is it utterly impossible to work that out?
Back when the war was going on over there, I had some classmates (in Australia) who were refugees from the conflict. We were all roughly 10 at the time, so the war was going on "in Bosnia" and nobody really cared about it more than that, but I'm wondering if any of these names might suggest a particular ethnic origin:

Mario Simić
Redzo Mujić (not sure on the first name there, we all pronounced it "Rego" like "registration", so maybe it was "Redžo"? The surname may also be a bit off)

Emina Muminović (I seem to remember she was from Sarajevo, but don't quote me on that)
Tea Tomasević (possibly "Tomašević", but we never pronounced it that way)
Adelaida Hadzić (possibly "Hadžić", which I'd guess is derived from "Hajj", but the pronunciation was always inconsistent)

Thanks for any assistance at all here.