The name Conwenna is a girl's name of Welsh, Cornish, Breton origin. Conwenna and is often added to lists like Cornish Baby Names and discussed in our forums with posts like "Names on NB that make you go WOW!".
From the experts:
Made familiar by poet William Blake. According to Blake, after her death, Conwenna "shines ... over the north with pearly beams gorgeous and terrible". Make of that what you will.