I can see the appeal but I'm not a huge fan... it's sort of weak. It needs something else - Lena is better. I do however think of it within a sort of trifecta of Sarah, Hannah and Leah - and Leah might win that because its less overused. I had a friend when I was in school named Leah, and another who spelled it Leeah, and I've never known any others, as far as I can remember.
http://www.behindthename.com/pnl/87410