With another A name, [name_f]Alice[/name_f], [name_f]Audrey[/name_f], and [name_u]Antoine[/name_u] or [name_f]Alice[/name_f], [name_f]Audrey[/name_f], and [name_f]Adele[/name_f]. I think work with the middles you already proposed (Antoine [name_f]Rebecca[/name_f] and [name_f]Adele[/name_f] [name_f]Rebecca[/name_f] both sound really nice imo.)
Other middles possibilities:
[name_u]Antoine[/name_u] [name_f]Louisa[/name_f]
[name_u]Antoine[/name_u] [name_f]Miranda[/name_f]
[name_u]Antoine[/name_u] [name_f]Cornelia[/name_f]
[name_u]Antoine[/name_u] [name_f]Rosalind[/name_f]
[name_u]Antoine[/name_u] [name_f]Bianca[/name_f]
For non matching initials I love the idea of [name_f]Alice[/name_f], [name_f]Audrey[/name_f], and [name_f]Sybil[/name_f], or [name_f]Alice[/name_f], [name_f]Audrey[/name_f], and [name_f]Claire[/name_f] / [name_f]Clara[/name_f].
Some middles name ideas:
[name_f]Sybil[/name_f] [name_f]Diana[/name_f]
[name_f]Sybil[/name_f] [name_f]Esmeralda[/name_f]
[name_f]Sybil[/name_f] [name_f]Clementine[/name_f]
[name_f]Sybil[/name_f] [name_f]Amelia[/name_f]
[name_f]Sybil[/name_f] [name_f]Magnolia[/name_f]
[name_f]Lovely[/name_f] combinations! I do love [name_f]Sibyl[/name_f] (this spelling). I can’t quite warm to [name_f]Clara[/name_f], but I like the Irish spelling, [name_u]Clare[/name_u]. I enjoy [name_u]Antonia[/name_u], also.
I don’t know why but [name_f]Celeste[/name_f] popped in my head immediately. I think it’s a beautiful name and goes great with [name_f]Alice[/name_f] and [name_f]Audrey[/name_f]
I think [name_f]Alice[/name_f], [name_f]Audrey[/name_f], & [name_f]Annabelle[/name_f] would be super sweet! I also love the previously posted idea of [name_f]Alice[/name_f], [name_f]Audrey[/name_f], & [name_f]Adele[/name_f]!