Wendy f
English: invented by J. M. Barrie for the ‘little mother’ in his play Peter Pan (1904). He took it from the nickname Fwendy-Wendy (i.e. ‘friend’) used for him by a child acquaintance, Margaret Henley. It has achieved widespread popularity in its short lifespan.
Variant: Wendi (rare).
First names dictionary. 2012.