One of the most reliable books in Croatian is 'Rjecnik osobnih imena' ('Dictionary of first names')by
Mate Šimundic with almost 100 000 names and it covers names used in Croatia, Serbia, Montenegro and Bosnia and Herzegovina.
He's a well known and respected linguist and onomastic expert, so I believe this book should be trustworthy.
The problem is that the book is not available on-line and I really don't know how you could get it (except to buy it in one of our on-line bookstores?).
There are many websites available, but their reliability is questionable. The two that seem more or less ok (if a bit superficial) are:
http://www.imehrvatsko.net/ -Croatian page
http://www.radiopek.co.yu/onomastikon.htm -Serbian page
I'll see if there are any others that might be useful.
ETA:
http://www.ringeraja.ba/imena.html
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PaigeParisPatrickPavelPyotrThis message was edited 5/27/2009, 6:05 PM