I like
Amanda Josephine, both names match each other's energy and sound nice.
Arista Bellatrix goes nicely together.
Daphne Regina is alright, though I personally don't think the vibe matches entirely and I don't like the double E sound.
Faith Serena and
Molly Annabelle are nice. I don't care for
Amethyst, but I think it pairs well with
Rhianna.
Saskia Bloom is my favourite, because I like
Saskia and Bloom is a fun middle name and adds some whimsy, but it's not so out there that it overshadows
Saskia.
Twila Irene sounds nice together, but I am personally not big on
Twila.