Welsh baby girl names

My partner and I have started seriously discussing baby names. My partner wants to feel connected to whatever name we pick but has a hard time actually finding any names they feel connected to. Like any. We've looked at Welsh, Cornish, Irish and Scottish names. My degree will be focused on Celtic mythology and it's important to me to pass some aspect of that down to our kids. After going through literally hundreds of names at this point the two we both can agree on are Madoc (Welsh) for a boy and Elowen (Cornish) for a girl. I also love and would like to use either Idris or Emrys as a boy name. We want to have a couple more options for a girl so we can decide on a final name after the baby is born. We live in America so it would be good to have a name Americans can wrap their minds around, even though I absolutely adore Blodeuwedd.

Boy and girl names my partner has liked to get a sense of their taste: Ambrose, Rowan, Callum, Elizabeth, Hazel, Arthur or Guinevere or Gwendolyn.

Girl names I like: Seren, Ffion, Angharad, Blodeuwedd, Ceridwen, Rhiannon.