I love the fact that you call your DH "husby", as do I! Anyway, I think
Arielle Ruth is very pretty, I like it a lot. Although I'm not too sure that it fits in that well with
Isaiah and
Naomi, which are so obviously Biblical. What about
Miriam,
Moriah,
Abigail,
Bethany,
Jemima,
Joanna,
Keziah,
Lydia,
Susannah, Rebekah/Rebecca,
Tabitha or
Talitha? All those names are Biblical too and many of those would sound nicer with your other kid's names imo.