My kids names are Celtic too
All the disney ones are great but here are some Celtic ones..
Keeley
Keegan
Deaghan (pronounced Deegan)
Kyra.. (LOVE this one)
Keldyn (my daughters name)
Kierstyn (my daughters name)
Camden (my son's name)
oh here's a Disney one.. hehe
Wendy (from Peter Pan or could be from Boxer farts)

Nanna (also from Peter Pan)
Melody (from Little Mermaid 2)