I like this Welsh name. I've known a Bronwen in the USA and three Bronwyns in Australia, where the name is not uncommon.
However, the correct Welsh spelling is -wen, not -wyn.
The ending means "white" and it's -wen for girls, -wyn for boys. Thus is Wales there are quite a few men called Wyn.
I thought I'd post this having seen the earlier post about the male name Lyn.