You can have as much fun as you like with the mn.
My sister really wanted to name her dd
Siobhan Clare, but switched it to
Clare Siobhan. It's worked out very well.
Angharad is one of my all time favorite names. I'd squeal like a little piggie if ever I met one here in the U.S., even if it was her mn.
As for fns, I can see (and keep in mind I'd name dds
Niamh and
Aoife):
Bethan,
Branwen,
Bryn (although I thought this is a Welsh boy's name),
Guinevere,
Morwenna (yay!) ---
Braith,
Maddox (too
Angelina Jolie-ish though), and
Madoc (great name).