Definition of "Meggie"

"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."

1977, Colleen McCullough, The Thorn Birds, Gramercy Books, published 1998, page 290

I teleported home one nightWith Ron and Sid and Meg.Ron stole Meggie’s heart awayAnd I got Sidney's leg.

1980 October, Douglas Adams, The Restaurant at the End of the Universe, London: Pan Books, page 170