Esen sounds like perfume to me -- maybe the similarity with the sound of "essence". No matter, it's not my thing. I could like it for someone else, though.
Aella is very pretty, but with how popular
Ella is, I'd never use it. People won't know its roots (or prn), and I'd be sad if it were confused for a creative spelling of
Ella. I say it like AY-la.