Wendy is derived from Qwendolin (Welsh i believe) the English took alot of names and Anglofied (read changed spelling) them for easy pronunciation of the name.
Also in the Celt or Gaelic, alot of female and male names were often the same, Kerry is a prime excample, however the English decided that Kerrie would be female and Kerry male:twisted:
From what i know anyway, so your both right:D
Baz.

