We are only 3 weeks away from our due date and cannot think of a beautiful and special name. Our baby’s older sisters are named [name_f]Cosette[/name_f] ([name_u]Les[/name_u] Mis) and [name_u]Harper[/name_u] [name_f]Jane[/name_f] (To Kill a Mockingbird)…
We appreciate any ideas! Thanks!
I adore your daughters’ names! Might I suggest…
[name_f]Clarissa[/name_f] (Mrs. Dalloway)
[name_u]Dagny[/name_u] ([name_m]Atlas[/name_m] Shrugged)
[name_u]Jordan[/name_u] (The Great [name_m]Gatsby[/name_m])
[name_f]Pearl[/name_f] (The [name_f]Scarlet[/name_f] Letter)
[name_f]Zelda[/name_f] ([name_m]Fitzgerald[/name_m])
[name_f]Zora[/name_f] ([name_u]Neale[/name_u] Hurston)
… to go along with your lit theme.
Oh I like above suggestion of “[name_f]Cosette[/name_f], [name_u]Harper[/name_u] [name_f]Jane[/name_f] & [name_f]Pearl[/name_f]” : sounds like three plucky & pretty heroines in an [name_m]Art[/name_m] Deco novel. 
Since [name_f]Cosette[/name_f] & [name_u]Harper[/name_u] [name_f]Jane[/name_f] seem to be so different, yet are linked with that literary thread, I would absolutely pick another lit-inspired name to bond the three sisters.
I think these would also work in the sibling set:
[name_f]Josephine[/name_f] - [name_m]Little[/name_m] Women nn [name_u]Jo[/name_u]
[name_f]Meg[/name_f] - Yes it’s from [name_m]Little[/name_m] Women too but also the name of [name_f]Christine[/name_f]'s best friend in Phantom of the [name_f]Opera[/name_f]
[name_f]Lyra[/name_f] - The [name_u]Golden[/name_u] Compass
[name_f]Frances[/name_f] - A Tree Grows in [name_u]Brooklyn[/name_u]nn [name_f]Francie[/name_f] or [name_u]Frankie[/name_u]
[name_f]Winnie[/name_f] - [name_m]Tuck[/name_m] Everlasting
[name_f]Beatrice[/name_f] - Much [name_f]Ado[/name_f] About Nothing
[name_f]Lucy[/name_f] - A Room with a View
[name_f]Eliza[/name_f] - Pygmalion (which My Fair Lady was taken from)
[name_f]Elinor[/name_f] - Sense and Sensiblity
[name_f]Alice[/name_f] - [name_f]Alice[/name_f] in Wonderland
[name_f]Matilda[/name_f] - from the book of that name, by [name_m]Roald[/name_m] Dahl
Oh, I adore your names! [name_u]Les[/name_u] Miserables has been a constant inspiration of mine, and I’m so glad someone found it one as well!
Names from classics that might suit your style:
[name_f]Estella[/name_f] - Great Expectations (I love [name_f]Cosette[/name_f], [name_u]Harper[/name_u] and [name_f]Estella[/name_f]!)
[name_f]Harriet[/name_f] - author [name_m]Beecher[/name_m] [name_m]Stowe[/name_m] of Uncle [name_m]Tom[/name_m]'s Cabin
[name_f]Georgiana[/name_f] - Pride and Prejudice
[name_f]Rose[/name_f] - as in the [name_f]Rose[/name_f] in The [name_m]Little[/name_m] [name_m]Prince[/name_m]
[name_f]Alice[/name_f] - [name_f]Alice[/name_f]'s Adventures Through the Looking Glass
[name_f]Sylvia[/name_f] - poet Plath of The [name_u]Bell[/name_u] Jar
[name_f]Irene[/name_f] - Adventures of [name_m]Sherlock[/name_m] [name_m]Holmes[/name_m]
[name_f]Zora[/name_f] - author [name_u]Neale[/name_u] Hurston of Their Eyes Were Watching God
[name_f]Nancy[/name_f] - [name_m]Oliver[/name_m] Twist
[name_f]Rosalind[/name_f] - As You Like It
[name_f]Mabel[/name_f] - An Ideal Husband (excellent Wilde play)
[name_f]Ophelia[/name_f] - [name_m]Hamlet[/name_m]
Your daughters have beautiful names!
Here are some other ideas that have yet to be mentioned…
[name_f]Leda[/name_f] - from Greek mythology, mother of [name_f]Helen[/name_f] of [name_m]Troy[/name_m] (Leda (mythology) - Wikipedia)
[name_f]Dorothy[/name_f] - The [name_m]Wizard[/name_m] of [name_m]Oz[/name_m]
[name_f]Iseult[/name_f] - [name_u]Tristan[/name_u] and [name_f]Iseult[/name_f] (Iseult - Wikipedia) (You could also spell it [name_f]Isolde[/name_f].)
[name_f]Iris[/name_f] - from Greek mythology, goddess of the rainbow and messenger to the gods (Iris (mythology) - Wikipedia)
[name_f]Ana[/name_f]ïs - poet [name_f]Ana[/name_f]ïs [name_m]Nin[/name_m] (Anaïs Nin - Wikipedia)
[name_f]Louisa[/name_f] - author [name_f]Louisa[/name_f] [name_f]May[/name_f] [name_u]Alcott[/name_u], who wrote [name_m]Little[/name_m] Women (Louisa May Alcott - Wikipedia)
[name_f]Adeline[/name_f]
[name_u]Leighton[/name_u]
[name_f]Imogen[/name_f]
[name_f]Valerie[/name_f]
[name_f]Mina[/name_f]
[name_f]Melody[/name_f]
[name_f]Arabella[/name_f]
[name_f]Elizabeth[/name_f]
[name_f]Cora[/name_f]
[name_f]Rose[/name_f]
[name_f]Lily[/name_f]
[name_f]Genevieve[/name_f]
[name_f]Maria[/name_f]
[name_f]Eleanor[/name_f]
[name_f]Margaret[/name_f]
[name_f]Alice[/name_f] and [name_f]Josephine[/name_f] are standouts!