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Gwen is fine on its own, it's a perfectly legit Welsh name. I also like Gwenno -'little white one'
I really wouldn't bother with Gwenhwyfar or Gwenllian outside Wales:
http://www.forvo.com/word/gwenllian/#cy
http://www.forvo.com/word/gwenhwyfar/#cy
- don't see why Gwen couldn't be short for Guinevere if you wanted it to be, or just spell it Gwenivere.

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There's also:
Gwenola
Gwenaëlle
Gwenan / Gwennan
Gwenith
Gwenda