To me, the spelling
Gwendolen looks neater. I still like that it's both a name with a lot of history, but with a ton of personality and not out of place in the modern world.
Please rate my personal short name lists (the latter includes combos):
www.behindthename.com/pnl/69381www.behindthename.com/pnl/69381/91835 (updated)
http://greens-end.myminicity.com/env