Bosnian, Croatian and Serbian are actially one language. Check, Polish and Romanian are other three different languages.
So far, four different languages have been mentioned. Each of them has its own pecularities in spelling and pronunciation. Each has its own grammar.
If we pay attention to the ", etc.", then more than 10 additional languages can arise: Albanian, Bulgarian, Greek, Estonian, Hungarian, Lituanian, Latvian, Russian, Slovak, Slovene, Turkish, etc. Each of them has its own grammar, spelling and pronunciation.
If you give us a list of your names, it may be possible to give the pronunciation for some.