Your kids have such beautiful names! From your list so far for #3[name_f][/name_f], I’m really liking [name_m]Xander[/name_m] & [name_m]Bastien[/name_m] for boys – they both reside in that sweet spot vibe & popularity-wise between [name_f]Aurelia[/name_f] & [name_m]George[/name_m] and really tie the sibling set together.
[name_f][/name_f]For girls, [name_f]Holiday[/name_f] “Holly” is a perfect option! She’s got the unexpected flair of [name_f]Aurelia[/name_f], but the grounded nickname [name_f]Holly[/name_f] to align with [name_m]George[/name_m].
[name_f][/name_f][name_f]Elora[/name_f] & [name_f]Cordelia[/name_f] are very pretty, but sound-wise are a bit tongue twister-y with [name_f]Aurelia[/name_f] for me.
A few more suggestions you might like:
[name_f][/name_f][name_f]Sasha[/name_f]
[name_f][/name_f][name_m]Cassian[/name_m]
[name_f][/name_f][name_m]Edwin[/name_m] / [name_m]Edmund[/name_m] / [name_m]Edward[/name_m]
[name_f][/name_f][name_m]Theodoric[/name_m]
[name_f][/name_f][name_m]Clarence[/name_m]
[name_f][/name_f][name_m]Klaus[/name_m]
[name_f][/name_f][name_m]Oscar[/name_m]
[name_f][/name_f][name_m]Henrik[/name_m]
[name_f][/name_f][name_m]Sebastian[/name_m]
[name_f][/name_f][name_m]Callum[/name_m]
[name_f][/name_f][name_m]Leopold[/name_m]
[name_f][/name_f][name_m]Augustine[/name_m] “August / Gus”
[name_f][/name_f][name_m]Laurence[/name_m]
[name_f]Lavender[/name_f]
[name_f][/name_f][name_f]Elowen[/name_f]
[name_f][/name_f][name_f]Matilda[/name_f]
[name_f][/name_f][name_f]Louisa[/name_f] / [name_f]Lovisa[/name_f]
[name_f][/name_f][name_f]Cecilia[/name_f]
[name_f][/name_f][name_f]Emmeline[/name_f]
[name_f][/name_f][name_f]Paloma[/name_f]
[name_f][/name_f][name_f]Stella[/name_f]
[name_f][/name_f][name_f]Dahlia[/name_f]
[name_f][/name_f][name_f]Elouisa[/name_f] / [name_f]Eloise[/name_f]
[name_f][/name_f][name_f]Delphine[/name_f]
I hope some of these strike your fancy! Best of luck!