The best thing about the name Jaana: Only the fact that it's finnish.
The worst thing about the name: People, even finns, tend to pronounce the double a too long although theoretically that shouldn't be a problem. It's just very annoying and double vowels are troublesome.
If my name wasn`t Jaana....: I don't know... nothing would be different, except the way I address myself.
Extra information: My name is Jane now.