Wendy is not of Hebrew origin and has no equivalent in Hebrew. In fact, the name has no meaning at all. it was a made up name created by J.M Barrie when he wrote Peter Pan.If you want to spell it out phonetically with Hebrew letters, it's: וונדי, which is pronounced Vendy (since there is no w in Hebrew).
Wendy Lanuza's birth name is Wendy Marissa Lanuza.
Wendy Sims's birth name is Wendy Crawford.
Wendy Dio's birth name is Wendy Galaxiola.
Wendy Pini's birth name is Wendy Fletcher.
Wendy Waldman's birth name is Wendy Steiner.
Wendy Westerfield's birth name is Wendy Moreira.
Wendy Schaal's birth name is Wendy K. Schaal.
Wendy Taubin's birth name is Wendy Ilyse Taubin.
Wendy Austin's birth name is Wendy Elizabeth Austin.
Wendy Bott's birth name is Wendy Luckett Bott.
Wendy Brainard's birth name is Wendy M. Brainard.
Wendy Braun's birth name is Braun, Wendy Allison.