I'm pretty meh about it, and always have been. Definitely BronwEn, though - BronwYn is ludicrous.
I know a
Bronwyn, mn
Jayne - as she says, her parents loved the letter Y - who went to a conference once, the kind where attendants at the door write one's name on a sticker and paste it to one's lapel. Her name was written, not by a native speaker of English, let alone Welsh, as Brown
Wine.