EDIT December 11, 2015:
Okay so I am a dork, lol! I was watching The Wizard of Oz a few weeks back and low and behold the good witch is not named Belinda but Glinda. I so thought it was Belinda. So it may not be a witches name in that movie but I keep thinking I saw it in that capacity some place, whether novel or movie, but maybe I am completely wrong there.
So instead of changing the details above I decided to own up to my stupid dorky mistake here in the edit and leave my stupidness above but do know as far as I know Belinda was not used in The Wizard of Oz.