Yeah,
Adela's too frilly for me, and
Adele makes me think of the singer. Not a big fan of
Adelaide either.
Can you think of any more? I'm surprised, I couldn't tell it was a nickname till I looked it up. Does it help that I'm looking at
Della as a variant of
Adela, so it still means "noble", like how
Lucy is a variant of
Lucia? That way, it has some substance. What do you think?