How am I meant to pick one from all these lovelies!!?
I picked [name_f]Ismay[/name_f] [name_u]Florence[/name_u] in the end! It’s familiar but distinctive with lovely nickname potential, a little mystical and magic, stylish with a hint of vintage too 
Some thoughts:
[name_f]Philippa[/name_f] [name_f]Jane[/name_f] - classic, strong and lovely with great nn potential
[name_f]Alice[/name_f] [name_f]Ottilie[/name_f] - cute and zippy but strong too
[name_f]Philippa[/name_f] [name_f]Daisy[/name_f] - charming, balanced and bright
[name_u]Florence[/name_u] [name_f]Daisy[/name_f] - vintage, sweet and stylish
[name_f]Jane[/name_f] [name_f]Francie[/name_f] - it’s okay, not my favourite though
[name_f]Cara[/name_f] [name_f]Niamh[/name_f] - lovely sound and meaning too!
[name_f]Daisy[/name_f] [name_f]Jane[/name_f] - simple, sweet and cute
[name_f]Harriet[/name_f] [name_u]Blythe[/name_u] - bright, vintage and classic - [name_f]Hattie[/name_f], [name_f]Etta[/name_f] and [name_f]Ettie[/name_f] are wonderful options
[name_f]Ottilie[/name_f] [name_f]Jane[/name_f] - stylish, balanced and lovely
[name_f]Ottilie[/name_f] [name_f]Margaret[/name_f] - quite nice, but [name_f]Ottilie[/name_f] [name_f]Jane[/name_f] feels more balanced and has nicer flow
[name_f]Ismay[/name_f] [name_f]Philippa[/name_f] - cute and balanced between classic and unexpected. I prefer [name_f]Ismay[/name_f] [name_u]Florence[/name_u] though
[name_f]Lyra[/name_f] [name_f]Francie[/name_f] - love [name_f]Lyra[/name_f] and [name_f]Francie[/name_f] is growing on me here! [name_f]Lyra[/name_f] [name_f]Francie[/name_f] is fun and sparky
[name_f]Phillipa[/name_f] [name_f]Sadhbh[/name_f] - I do enjoy both names but there’s a heaviness about it that means it doesn’t quite sing like your others