Although not as siblings, that would be weird. :-P
If I were to make combos solely with the names you've provided, then
Guinevere Elaine and
Arthur Taliesen. Otherwise,
Guinevere Elise &
Arthur Edmund.
Please rate my personal name lists:
www.behindthename.com/pnl/69381www.behindthename.com/pnl/69381/109399www.behindthename.com/pnl/69381/91835http://greens-end.myminicity.com