I don't speak Italian so I think of
Della as a nn for
Adela more.
Della MargotDella CatherineDella SophieDella PhoebeDella JacquelineDella MarionDella JuniperDella SuzanneDella CassandraDella VivienDella Sandrine Della Charlotte /
Caroline
If you're still nervous about
Della, hve you considered
Delia instead? The vowel sound is different, but it feels like it can stand on its own better.
Delia Genevieve is my stock combo for her.