Well, not every name is of Slavic origin, but they're all common in Croatia. I'd love to hear your comments (be harsh if you want to).
BOY:
Damir Nataniel
Bojan ZvonimirDmitar ZvonimirPetar KresimirZoran VjekoslavIvan Dragutin
Augustin Dario – Tin
Jasenko
DominikNeven
SebastijanJuraj Domagoj
Luka Maksimilijan
Filip AntonioPavel BranimirBorna
LeonardMarko Justinijan
Jadran
GabrielRafael Shandor
Mihael RomanDanko Slaven
GIRL:
Jelena MarijaIvana OliviaIva Leonarda
Renata Glorija
Jadranka ZojaMirna Josipa
Vesna MagdalenaMirta Lidija
Mirjana AlmaMarina KsenijaKarla Ozana
Marija UnaIskra HelenaAna Nevenka
Barbara Klara
P.S. These are not all names I love or names I plan to use, they just went well in combos, imo.