How did the name Wendy originate?

The name Wendy was invented by J.M. Barrie for a character in his 1904
play Peter Pan. The poet W.E. Henley, a close friend of Barrie’s, had a
four-year-old daughter, Margaret, and because her father always referred
to Barrie as “friend,” she would try to imitate him by saying “fwend” or
“fwendy-wendy.” Sadly, Margaret died at the age of six, but her expres-
sion lives on in Peter Pan and all the Wendys that have followed.