Aww, I’m honored to hear that and glad I can help 
I’m also glad you tagged me, or this thread might have slipped past me!
[name_f]Arabella[/name_f]
I love [name_f]Arabella[/name_f] and love the combo [name_f]Arabella[/name_f] [name_f]Lilac[/name_f] [name_f]Jane[/name_f]! I think she works very well stylistically with your other names. However, I wouldn’t use her with [name_f]Isobel[/name_f] because of the shared bel/bella ending.
[name_f]Aurora[/name_f]
I think [name_f]Aurora[/name_f] works perfectly with your names! She feels current and stylish, but with a long history. She’s maybe a little trendier feeling than your other names, but not in a bad way. I like [name_f]Aurora[/name_f] [name_f]Vivi[/name_f] [name_f]Joy[/name_f], I think she’s so bright and fun and summery. But if you’re not set on her, maybe…
middle name ideas
[name_f]Aurora[/name_f] [name_f]Piper[/name_f] [name_f]Kate[/name_f]
[name_f]Aurora[/name_f] [name_f]Madeleine[/name_f] [name_f]Opal[/name_f]
[name_f]Aurora[/name_f] [name_f]Lucy[/name_f] [name_f]Bronwyn[/name_f]
[name_f]Aurora[/name_f] [name_f]Julienne[/name_f] [name_f]Sage[/name_f]
[name_f]Aurora[/name_f] [name_f]Magdalen[/name_f] [name_f]Fifer[/name_f]
[name_f]Aurora[/name_f] [name_f]Vivian[/name_f] [name_f]Zoe[/name_f]
[name_f]Aurora[/name_f] [name_f]Genevieve[/name_f] [name_f]Heidi[/name_f]
[name_f]Aurora[/name_f] [name_f]Adelaide[/name_f] [name_f]Maris[/name_f]
[name_f]Aurora[/name_f] [name_f]Lillian[/name_f] [name_f]Thais[/name_f]
[name_f]Aurora[/name_f] [name_f]Maisie[/name_f] [name_f]Marcela[/name_f]
[name_f]Aurora[/name_f] [name_f]Cadhla[/name_f] [name_f]Sabine[/name_f]
[name_f]Aurora[/name_f] [name_f]Lucy[/name_f] Belém
[name_f]Aurora[/name_f] [name_f]Vivienne[/name_f] [name_m]Sol[/name_m]
[name_f]Ariane[/name_f] / [name_f]Arianne[/name_f]
I like this name, but I would (maybe incorrectly 
) pronounce the two spellings differently (ahh-ree-AHN versus are-ee-ANN). I think they may have spelling and pronunciation issues that [name_f]Arabella[/name_f] and [name_f]Aurora[/name_f] wouldn’t, which isn’t a deal breaker (my own name, as you know, has multiple spellings and pronunciations, and that doesn’t bother me!) but I do think it makes it stand out from the rest of your list which is more familiar in the US. I do know an [name_f]Ariane[/name_f] in the US, but if I didn’t know her I’m not sure I’d be familiar with the name. I love [name_f]Ariane[/name_f] [name_f]Wisteria[/name_f] and [name_f]Ariane[/name_f] [name_f]Camellia[/name_f] from your list! Some more ideas could be:
middle name ideas
[name_f]Ariane[/name_f] [name_f]Emmanuelle[/name_f] [name_f]Poppy[/name_f]
[name_f]Ariane[/name_f] [name_f]Magdalen[/name_f] [name_f]Esme[/name_f]
[name_f]Ariane[/name_f] [name_f]Ingrid[/name_f] [name_f]Sophie[/name_f]
[name_f]Ariane[/name_f] [name_f]Virginia[/name_f] [name_f]Malou[/name_f]
[name_f]Ariane[/name_f] [name_f]Elisabeth[/name_f] [name_f]Eilidh[/name_f]
[name_f]Ariane[/name_f] [name_f]Patience[/name_f] [name_f]Ayala[/name_f]
[name_f]Ariane[/name_f] [name_f]Hazel[/name_f] [name_f]Fiadh[/name_f]
[name_f]Ariane[/name_f] [name_f]Cosima[/name_f] [name_f]Vivi[/name_f]
[name_f]Ariane[/name_f] [name_f]Augusta[/name_f] [name_f]Maris[/name_f]
[name_f]Ariane[/name_f] [name_f]Lisbeth[/name_f] [name_f]Audrey[/name_f]
[name_f]Ariane[/name_f] [name_f]Clementine[/name_f] [name_f]Maya[/name_f]
[name_f]Ariane[/name_f] [name_f]Matilde[/name_f] [name_f]Summer[/name_f]
[name_f]Ariane[/name_f] [name_f]Charlotte[/name_f] [name_f]Diana[/name_f]
Overall, I think [name_f]Aurora[/name_f] matches best stylistically with [name_f]Isobel[/name_f], [name_f]Adele[/name_f], [name_f]Evangeline[/name_f], [name_f]Vera[/name_f], and [name_f]Claire[/name_f]! [name_f]Arabella[/name_f] is a very close second, though, and [name_f]Ariane[/name_f] does work as well. (my apologies for this completely unhelpful analysis of “they all work”, haha)