[name_f]Adelaide[/name_f] and [name_f]Savannah[/name_f] or [name_f]Adeline[/name_f] and [name_f]Savannah[/name_f]!
[name_f]Adelaide[/name_f] and [name_f]Savannah[/name_f] are connected subtly since they’re both places and [name_f]Della[/name_f] and Savvy together are cute!!
[name_f]Adeline[/name_f] and [name_f]Savannah[/name_f] both feel fresh and sweet and again, [name_f]Della[/name_f] and Savvy are great. [name_f]Adelyn[/name_f] would also fit.
I think [name_f]Nora[/name_f] and [name_f]Delilah[/name_f] could work too, I just prefer your other options.
I like [name_f]Adelaide[/name_f] & [name_f]Savannah[/name_f]. They’re similar lengths, and have different ending sounds, which I like in a pair. They fit together stylistically quite well, too. [name_f]Nora[/name_f] would come in second.
[name_f]Adeline[/name_f] & [name_f]Eleanor[/name_f] feel of a very different style to [name_f]Savannah[/name_f] and [name_f]Delilah[/name_f] repeating the -ah ending I’m not a big fan of.