Wow, what a lovely story! Congrats on your little girl. She will be well guarded by all those brothers. To fit with their names, you need something a little bit obscure, not as obvious as [name_f]Mary[/name_f] or [name_f]Elizabeth[/name_f] or [name_f]Rachel[/name_f].
I love [name_f]Adah[/name_f] ([name_m]AH[/name_m]-dah) for you. I think it works beautifully even though the ending is the same as [name_m]Judah[/name_m].
[name_m]Sebastian[/name_m], [name_m]Atticus[/name_m], [name_m]Ezekiel[/name_m], [name_m]Bartholomew[/name_m], [name_m]Judah[/name_m], & [name_f]Adah[/name_f]
or [name_f]Esther[/name_f]… fitting name for little beauty queen.
[name_m]Sebastian[/name_m], [name_m]Atticus[/name_m], [name_m]Ezekiel[/name_m], [name_m]Bartholomew[/name_m], [name_m]Judah[/name_m], & [name_f]Esther[/name_f]
or [name_f]Claudia[/name_f]
[name_m]Sebastian[/name_m], [name_m]Atticus[/name_m], [name_m]Ezekiel[/name_m], [name_m]Bartholomew[/name_m], [name_m]Judah[/name_m], & [name_f]Claudia[/name_f]
or [name_f]Drusilla[/name_f]… has the lovely meaning “watered by the dew”
[name_m]Sebastian[/name_m], [name_m]Atticus[/name_m], [name_m]Ezekiel[/name_m], [name_m]Bartholomew[/name_m], [name_m]Judah[/name_m], & [name_f]Drusilla[/name_f]
or [name_f]Lydia[/name_f]… has been very popular lately on Nameberry, for good reason. It sounds so fresh.
[name_m]Sebastian[/name_m], [name_m]Atticus[/name_m], [name_m]Ezekiel[/name_m], [name_m]Bartholomew[/name_m], [name_m]Judah[/name_m], & [name_f]Lydia[/name_f]
or [name_f]Myra[/name_f]… very pretty, but feels a little incomplete somehow. Maybe with a longer middle name?
[name_m]Sebastian[/name_m], [name_m]Atticus[/name_m], [name_m]Ezekiel[/name_m], [name_m]Bartholomew[/name_m], [name_m]Judah[/name_m], & [name_f]Myra[/name_f]
or [name_f]Phoebe[/name_f]… one of my favorites. So elegant.
[name_m]Sebastian[/name_m], [name_m]Atticus[/name_m], [name_m]Ezekiel[/name_m], [name_m]Bartholomew[/name_m], [name_m]Judah[/name_m], & [name_f]Phoebe[/name_f]
or [name_f]Priscilla[/name_f]… it’s longer, but it has that strong-yet-soft sound you seek.
[name_m]Sebastian[/name_m], [name_m]Atticus[/name_m], [name_m]Ezekiel[/name_m], [name_m]Bartholomew[/name_m], [name_m]Judah[/name_m], & [name_f]Priscilla[/name_f]
or [name_f]Tamar[/name_f]… sprang to mind second after [name_f]Adah[/name_f]. [name_f]Do[/name_f] you mind the negative connotations of her Biblical account?
[name_m]Sebastian[/name_m], [name_m]Atticus[/name_m], [name_m]Ezekiel[/name_m], [name_m]Bartholomew[/name_m], [name_m]Judah[/name_m], & [name_f]Tamar[/name_f]
or [name_f]Zillah[/name_f]… so unusual yet simple.
[name_m]Sebastian[/name_m], [name_m]Atticus[/name_m], [name_m]Ezekiel[/name_m], [name_m]Bartholomew[/name_m], [name_m]Judah[/name_m], & [name_f]Zillah[/name_f]
I like [name_u]Artemis[/name_u] and [name_f]Abigail[/name_f], but I think they’re too close to [name_m]Atticus[/name_m]. (Same rhythm and similar sounds.)
[name_f]Jemima[/name_f] is also lovely, but strikes me as out of sync with the boys’ names.
Have fun! It would be interesting to get the brothers’ input! 
PS [name_m]Just[/name_m] saw that you like [name_f]Keziah[/name_f]… my bff in University was named Quezia. [name_f]Keziah[/name_f] was the daughter of [name_m]Job[/name_m]. Look for her at the very end of the Book of [name_m]Job[/name_m]. Her name means “perfume, perfumed one.” [name_f]Lovely[/name_f], no?! 