A note on male suffixes thoroughly ignored: For goodness sake, please don’t add “-wyn” or “-son” to any girl’s names, because both “-wyn” and “-son” suffixes are for males. The "-son" suffix literally means "son," as in "son of [insert male name here]" and you typically see "-son" in traditional surnames. It is the difference between a Julia and a Julian, a Naoki and a Naoko, a Carole and a Caroll. Most of us can’t help but fall in love with some Welsh and English names, such as Bronwyn and Madison (and Madison has been completely taken over by Team Pink) but understanding and researching a name you’re interested in makes all the difference in the world. You should have an interest beyond “what sounds good,” and delve deeper into meaning, suffix/gender, associations good or bad, namesakes and origin. And yes, even Gwyn is masculine, used for boys in Wales, where the suffixes "-wyn" and "-wen" come from.
In my personal opinion, the only way using a "-son" name is justified is by naming a baby girl after a beloved male relative, better in the middle spot (and NOT when there are feminine variants of that male name available - in other words, don't name her Jamison instead of Jamie, the female variant of James).
Check out this post for more details: http://www.babynamewizard.com/archives/2011/7/the-name-that-launched-a-thousand-female-sons