Title is self explanatory, need name for 3rd child, older siblings are [name_m]Marshall[/name_m] “Mars” [name_u]Vaughn[/name_u] and [name_u]Sierra[/name_u] “SJ” [name_f]Josephine[/name_f].
Other girl names I like-
[name_f]Juliet[/name_f]
[name_f]Valerie[/name_f]
[name_f]Leonora[/name_f]
[name_f]Vera[/name_f]
[name_f]Tessa[/name_f]
[name_f]Francesca[/name_f]
[name_f]Leonora[/name_f], [name_f]Francesca[/name_f], [name_f]Vera[/name_f] and [name_f]Tessa[/name_f] go great!
[name_f]Mila[/name_f]
[name_f]Tess[/name_f]
[name_f]Johanna[/name_f]
[name_u]Florence[/name_u]
[name_f]Valeria[/name_f] / [name_f]Valentina[/name_f]
[name_f]Frida[/name_f]
[name_f]Yana[/name_f]
[name_f]Helena[/name_f] / [name_f]Elena[/name_f]
[name_f]Anouk[/name_f]
[name_f]Bessie[/name_f]
[name_f]Cecilia[/name_f]
[name_f]Cinda[/name_f]
[name_f]Crystal[/name_f]
[name_f]Edna[/name_f]
[name_f]Elaina[/name_f]
[name_f]Gwendolyn[/name_f]
[name_f]Kaia[/name_f]
[name_f]Kayla[/name_f]
[name_f]Lucille[/name_f]
[name_f]Nina[/name_f]
[name_u]Risa[/name_u]
[name_u]Ruby[/name_u]
[name_f]Sally[/name_f]
[name_f]Sonya[/name_f]
[name_f]Teressa[/name_f]
[name_f]Vada[/name_f]
[name_f]Valeria[/name_f]
I like [name_f]Valerie[/name_f], [name_f]Juliet[/name_f], [name_f]Tessa[/name_f] and [name_f]Francesca[/name_f] for you a lot 
Other ideas:
[name_f]Emmeline[/name_f] ‘Emmy’ ‘Mila’
[name_f]Lois[/name_f] ‘Lolo’ ‘Lissy’
[name_f]Estella[/name_f] ‘Tessa’ ‘Essie’
[name_f]Angelie[/name_f] / [name_f]Angelica[/name_f] ‘Angie’ ‘Annie’ ‘Elle’
[name_f]Loretta[/name_f] ‘Lottie’ ‘Lotta’ ‘Lettie’ ‘Lori’ ‘Etta’
[name_f]Veronica[/name_f] ‘Ronni’ ‘Vera’
[name_f]Elspeth[/name_f] ‘Effie’ ‘Elsie’
[name_f]Nadia[/name_f] ‘Nia’
[name_f]Tallulah[/name_f] ‘Tully’ ‘Lula’ ‘Tallie’
[name_m]Marshall[/name_m], [name_u]Sierra[/name_u], and…
[name_f]Veronica[/name_f]
[name_f]Cressida[/name_f]
[name_f]Estelle[/name_f]
[name_f]Dorothea[/name_f]
[name_f]Rhiannon[/name_f]
[name_f]Augusta[/name_f]
[name_f]Victoria[/name_f]
[name_f]Miranda[/name_f]
[name_f]Talia[/name_f]
[name_f]Gemma[/name_f]
[name_f]Tabitha[/name_f]
[name_f]Viola[/name_f]
Of yours, I think [name_f]Juliet[/name_f], [name_f]Tessa[/name_f], or [name_f]Valerie[/name_f] round out the sibset the best.
Other options:
[name_f]Annette[/name_f] “Annie, Nettie”
[name_f]Phoebe[/name_f] “Pheeb”
[name_f]Susannah[/name_f] “Suzie”
[name_f]Gianna[/name_f] “Gia”
Jenaye “Jen”
[name_f]Ophelia[/name_f] “Lia” or even “Ophi/Opie”
Hopefully these help! 
I have to say [name_f]Valerie[/name_f] or [name_f]Vera[/name_f]
[name_f]Juliet[/name_f] “Jett” or [name_f]Francesca[/name_f] “Frankie” are my favourites from your list.
[name_f]Amelia[/name_f] “Miller or Ames”
[name_f]Delilah[/name_f]
[name_u]Hazel[/name_u]
Those are some great names! I especially like [name_f]Tessa[/name_f] and [name_f]Juliet[/name_f]. 
[name_u]Robin[/name_u]
[name_u]Ruby[/name_u]
[name_f]Jayda[/name_f]
[name_f]Eleanor[/name_f]
[name_f]Willa[/name_f]
[name_f]Matilda[/name_f] ‘Tilly’
[name_f]Lyra[/name_f]
[name_u]Remi[/name_u]
[name_f]Scarlet[/name_f]
[name_f]Bianca[/name_f]
[name_f]Augusta[/name_f]