Yes, I think
Gwen can stand on its own. It's pretty, but for some reason I think it sounds a little "blah" to me. Plus, it reminds me of
Gwen Stefani, and by extension her vaguely racist Harajuku Girls...
I prefer
Blanca over
Gwen. It's more classic, and was a common royal name among the Spanish monarchies at one time.
Miranda
Proud adopter of 15 punctuation marks; see my profile for their names.