I love the sound and look of many Welsh names. I like
Carys,
Aderyn,
Mairwen,
Eleri,
Bethan, and
Brynn for girls, and
Celyn (KEL-in),
Morgan, and
Rhys for boys.
From your list, I like Arianwen,
Bethan,
Brynn (only this spelling), and
Morwenna for girls, and
Braith,
Bran,
Maddox, and
Madoc for boys.