I don't like Jane at all. Jean is okay, but just okay.
How to spell Jane-plus a depends on how you want it pronounced. I know someone with a daughter around seven named Jayna. Her name's pronounced just like it's spelled, so I'd spell it like that if I wanted that pronunciation. I've seen Jana pronounced Janna, Jonna and Yonna.
I'd pick Janelle, this spelling. Janel looks incomplete. Janelle Rebecca?
Before you criticize a man, walk a mile in his shoes. That way, when you criticize him, you're a mile away and you have his shoes!
Steve Martin