[name_f]Ava[/name_f]
[name_f]Olivia[/name_f]
[name_f]Isla[/name_f](I don’t think we want to use the [name_f]Ayla[/name_f] spelling)
Thank you!
I think my favorite is [name_f]Isla[/name_f] [name_f]Olivia[/name_f] [name_f]Rose[/name_f] or [name_f]Olivia[/name_f] [name_f]Ava[/name_f] [name_f]Rose[/name_f] but I know whatever you choose will be right for your daughter. Good luck!
I prefer [name_f]Isla[/name_f] [name_f]Olivia[/name_f] [name_f]Rose[/name_f] 
[name_f]Olivia[/name_f] [name_f]Isla[/name_f] [name_f]Rose[/name_f] is beautiful!
Obviously if you want to still with A trend for the first name then [name_f]Arabella[/name_f] [name_f]Isla[/name_f] [name_f]Rose[/name_f] would be lovely
[name_u]Ayden[/name_u] , [name_m]Asher[/name_m] & [name_f]Olivia[/name_f] (my fave)
[name_u]Ayden[/name_u] , [name_m]Asher[/name_m] & [name_f]Arabella[/name_f]
[name_f]Ava[/name_f], [name_f]Isla[/name_f] and [name_f]Olivia[/name_f], though all lovely names are all incredibly common these days. I don’t know if that bothers you but both your sons have much less common names so I though I would make that point.
Last year in the USA, [name_f]Olivia[/name_f] was #2 and [name_f]Ava[/name_f] was #3. [name_f]Isla[/name_f] was #103 but it seems to be on the rise.
https://nameberry.com/popular_names/US
Again, they are all lovely names (otherwise they wouldn’t be so popular lol) but you have a second chance to get your baby’s name right, so you need to take every element into consideration. It’s possible you might be wishing you had stuck with the more uncommon “[name_u]Avery[/name_u]” in a few years when you’ve met the 10th [name_f]Ava[/name_f] or [name_f]Olivia[/name_f] in your child’s class
I would myself pick a less popular name that was phonetically related to [name_u]Avery[/name_u]. There are many lovely options, such as:
Aimery
Ainsley
Audrey
Aurelie
Aurelia
Aurielle
Avamaria
[name_f]Aviana[/name_f]
[name_f]Aviva[/name_f]
[name_f]Avalon[/name_f]
[name_f]Aveline[/name_f]
Avella
Aven
Avienne
Avonlea
Ayla
Azalea
Azaria
Azelie
Ellerie
Elodie
Elovie
Elvie
Embry
[name_f]Emerie[/name_f]
Enslie
Evelina
Evienne
Everleigh/Everly
[name_u]Ezri
Haven
Novalie
Olivine
Waverley[/name_u]
[name_f]Isla[/name_f] [name_f]Olivia[/name_f] [name_f]Rose[/name_f] is pretty. I don’t like [name_f]Ava[/name_f] and [name_f]Olivia[/name_f] with each other (too much v).
[name_f]Ella[/name_f] ‘Purrell’ and [name_f]Arabella[/name_f] ‘Purrell’ don’t sound great–the double ‘elle’ sounds seem rhymey.
[name_f]Olivia[/name_f] [name_f]Isla[/name_f] [name_f]Rose[/name_f]