[name_f]Hannah[/name_f] [name_f]Faye[/name_f]! It’s beautiful and goes very well with your sons names. Plus if you used [name_u]Charlie[/name_u], other people might think you had three sons.
I would choose either [name_f]Hannah[/name_f] or [name_f]Charlize[/name_f]/[name_f]Charlotte[/name_f]. [name_f]My[/name_f] best friend is a [name_f]Charlotte[/name_f] who went by [name_u]Charlie[/name_u] all through childhood. Now she is a doctor and an officer in the army - [name_u]Charlie[/name_u] just doesn’t quite fit anymore, she prefers the more formal [name_f]Charlotte[/name_f] and I’m glad she has that option even though I will always call her [name_u]Charlie[/name_u] on the phone!
Haha! I never made that connection but totally hear it now.
Thank you everyone! I would absolutely love, love, [name_u]LOVE[/name_u] to use [name_f]Charlotte[/name_f] and the nn [name_u]Charlie[/name_u] but my husband despises [name_f]Charlotte[/name_f]. 
It’s funny that a lot of you said you could see [name_u]Charlie[/name_u] being in the sibset for a boy. We are actually using [name_m]Charles[/name_m] nn [name_u]Charlie[/name_u] if this one turns out to be a boy.
I think we will be going with [name_f]Hannah[/name_f] [name_f]Faye[/name_f] if this one is a girl. Thank you so much!