Are you sure about brothers
Seamus and
James? Seems like too much of a good thing to me.
I like
Wynne and
Phoebe best from your girl list. They seem less trendy and more energetic and fun-loving.
Darby and
Darcy just turn me right off, as do
Violet and
Viola for different reasons.
On the boy side, I like
Rory for a boy but I'm not clear how you derive it from
Riordan. Just
Rory would be fine. I also like
Rowan, and could live happily with
Desmond or
Duncan.
Rowan Jack, perhaps?
Rowan Desmond?