1) I like it a lot, but then, I pretty much like anything in the
Adelle family grouping of names. :)
2) Yes.
Love it!
3) I think it would work well as a NN.
Ada,
Dell,
Della, or
Addy (if it's your thing, though I'm inclined to think not) would also work.
4) Yes, and that's a handsome combo, by the way.