Thoughts on these ideas:
[name_f]Alice[/name_f] [name_f]Noelani[/name_f]
Cvita [name_f]Delphine[/name_f] (Cvita is name meaning flower & totally pronounceable here where I’m from)
[name_f]Amethyst[/name_f] [name_f]Celia[/name_f]
[name_f]Bethany[/name_f] [name_f]Selina[/name_f]
[name_f]Harriet[/name_f] [name_f]Sunniva[/name_f]
[name_f]Callisto[/name_f] [name_f]Melissa[/name_f]
[name_f]Celia[/name_f] [name_f]Margaret[/name_f]
[name_f]Melissa[/name_f] [name_f]Janelle[/name_f]
[name_f]Bethany[/name_f] [name_f]Juliet[/name_f]
[name_f]Alice[/name_f] [name_f]Mary[/name_f]
As I am not a fan of [name_f]Harriet[/name_f] or [name_f]Delphine[/name_f], I have no idea of a suitable middle.
[name_f]Alice[/name_f] [name_f]Noelani[/name_f]: Although I do feel the names are a bit stylistically mismatched from one another ([name_f]Alice[/name_f] is classic and prim while [name_f]Noelani[/name_f] is flowing and unique), I really like the flow of them together. They share the “l” sound, which helps with cohesion, but doesn’t disrupt the flow.
Cvita [name_f]Delphine[/name_f]: Beautiful! I love both of these names, and they sound nice together. One caveat: Are you okay with having two flower names in the same name?
[name_f]Amethyst[/name_f] [name_f]Celia[/name_f]: Both of these names are quite lovely, and I particularly love [name_f]Celia[/name_f]. However, I think [name_f]Celia[/name_f] [name_f]Amethyst[/name_f] has a better flow.
[name_f]Bethany[/name_f] [name_f]Selina[/name_f]: Once again, I think the style of these names is a bit mismatched, although the flow is fine.
[name_f]Harriet[/name_f] [name_f]Sunniva[/name_f]: This is quite pretty, and both names are unexpected yet lovely.
[name_f]Callisto[/name_f] [name_f]Melissa[/name_f]: I am not a huge fan, sorry. The repeating “-lis” makes this too repetitive for me.
[name_f]Alice[/name_f] [name_f]Noelani[/name_f] - I like it - [name_f]Alice[/name_f] is so classic and [name_f]Noelani[/name_f] really adds something
Cvita [name_f]Delphine[/name_f] - I really like the soft [name_f]Delphine[/name_f] with Cvita
[name_f]Amethyst[/name_f] [name_f]Celia[/name_f] - I’d prefer [name_f]Celia[/name_f] [name_f]Amethyst[/name_f] but [name_f]Amethyst[/name_f] [name_f]Celia[/name_f] is lovely too
[name_f]Bethany[/name_f] [name_f]Selina[/name_f] - I’m not sure about this. It doesn’t quite work for me, but I can’t quite decide why. Maybe they just don’t quite fit in my mind
[name_f]Harriet[/name_f] [name_f]Sunniva[/name_f] - [name_u]Love[/name_u] how bright this is! Probably my favourite 
[name_f]Callisto[/name_f] [name_f]Melissa[/name_f] - Like with [name_f]Bethany[/name_f], I’m not quite sure. They just don’t sit quite right to me. [name_f]Callisto[/name_f] [name_f]Melina[/name_f] or [name_f]Callisto[/name_f] [name_f]Marina[/name_f]? [name_m]Even[/name_m] [name_f]Callisto[/name_f] [name_f]Bethany[/name_f] or [name_f]Bethany[/name_f] [name_f]Callisto[/name_f]?