Thanks for fishing that out, waltern. (I think that Wednesday was a character in The Addams Family)"The first name Wendy was very uncommon in the Anglosphere before J. M. Barrie's work and its subsequent popularity has led some to credit him with "inventing" it."
So, interestingly, it was part of Barrie's own nickname!Wendy (feminine) English: invented by J. M. Barrie for the 'little mother' in his play Peter Pan (1904). He took it from the nickname Fwendy-Wendy (ie 'friend') used for him by a child acquaintance, Margarent Henley. It has achieved widespread popularity in its short lifespan.