Allegra - Ally is so overused - are there any other options?
Eggo? Alla? Ara?
Calista - I could handle Callie/Cali, but would appreciate other suggestions.
Calla? Cass? Cassie? Lissie? Alice?
Juliet - Jet is growing on me, but I don't love it yet. Julie/Jewel is a bit too dated. Lia is a bit of a stretch.
Ettie? Jet is cute.
Sapphira - I have no idea for this one!
Saph? Saphie? Phira?
Valentina - I hate Val, and Tina is too dated.
Tini ("teenie")? Lina?
Seraphina - Sera is too common.
Phina? Phi? Phia ("fia")? Phi ("fee")? Raphie?