If you think about it, there aren’t actually that many Au- girl names!
The majority of au- girl names on the website are Audrey variations, Augusta variations and Aurelia variations. So it’s only natural to see those names pop up a lot, considering that Au- names are pretty rare + most people will only know the more well-used ones (Audrey rather than Audriya).
My personal favourite is Autumn, I like the imagery, sound and nicknames!
aurelia thérèse “goldie”
and i like august and autumn as middles 
so happy to see another lover of aurelia “goldie” 
[name_f]My[/name_f] favourites are [name_f]Aude[/name_f] and [name_f]Audine[/name_f] 
Probably [name_f]Audrey[/name_f] — [name_f]Audrey[/name_f] [name_f]Louisa[/name_f]. 
[name_u]August[/name_u] [name_f]Louisa[/name_f] or [name_u]Audie[/name_u] [name_f]Elizabeth[/name_f]!
Aubrieta [name_f]Clio[/name_f]
[name_f]Audrey[/name_f], [name_u]Aubrey[/name_u], [name_m]Augie[/name_m], [name_u]August[/name_u]
[name_u]Auden[/name_u]!
[name_f]Audrey[/name_f] [name_f]Eloise[/name_f] or [name_f]Aurelia[/name_f] [name_f]Maeve[/name_f]
[name_f]Aurora[/name_f] [name_u]Blair[/name_u]
Maybe [name_u]Austen[/name_u] [name_u]Dove[/name_u] or [name_u]Auden[/name_u] [name_m]Fletcher[/name_m]
I love aurelie (french variation of aurelia) and also augustine
[name_u]Augustine[/name_u]!
Aurora or Audrey
aurembiaix !! this is currently my first choice for a girl anyway
her name would be aurembiaix cecily alice 
[name_f]Audra[/name_f] 
I would probably go with [name_f]Audriana[/name_f] [name_f]Carys[/name_f] or [name_f]Autumn[/name_f] [name_f]Carys[/name_f]. I love [name_f]Audrey[/name_f] also so [name_f]Audrey[/name_f] [name_f]Carys[/name_f] might be an option as well.
Aurelia Blythe
[name_f]Audrienne[/name_f] Flode as of this second, but it will probably be different in 5 mins :]