I think [name_f]Shay[/name_f] and [name_f]Sloane[/name_f] are a bit too matchy. I love [name_f]Reese[/name_f] with your sibset!
Other ideas: [name_f]Dove[/name_f], [name_f]June[/name_f], [name_f]Maeve[/name_f], [name_f]Rue[/name_f], [name_f]Belle[/name_f], [name_f]Kate[/name_f], [name_f]Tess[/name_f], [name_f]Nell[/name_f], [name_f]Liv[/name_f], [name_f]Hope[/name_f]