"Meggie...It hasn't got enough dignity, it doesn't suit you a bit. I'd rather you were called something like Belinda or Madeline, but if Meggie's the best you've got to offer, I'll go for it. What's the Meggie stand for - Margaret?" "No, Meghann." "Ah, now that's more like! I'll call you Meghann." "No, you won't!" she snapped. "I detest it!"
Source: wiktionary