The name you're looking for to go with Oberon and Titania is Maeve. Best I can figure, McGuire (not having met her, I default to 'we are not on a first-name basis') looked at Shakespeare's fairies and decided 'Mab' wasn't a good enough name, but 'Maeve' is basically the same name.

Sounds like you had a ball. Wish I coulda been there.