A diminutive of the female given names Margaret and Megan.
Old Meg was brave as Margaret Queen,
And tall as Amazon:
An old red blanket cloak she wore,
A chip-hat had she on. 1818, John Keats, Meg Merrilies:
My mother thought Meg a sweet child, that's what she called her, a sweet child, although she was critical of her name.
'What kind of name is that,' she said.
'It's short for Margaret,' I said. 'But everyone calls her Meg.'
'Well, that's no name for a girl, that's a scullery maid's name. I fault the mother.' 1985, E. L. Doctorow, World's Fair, Fawcett Crest, published 1986, →ISBN, page 208:
The Bone Valley Region of Florida has multiple Miocene nursery sites in which neonate and young Meg teeth are abundant, as well as food sources. Young Megs probably consumed a lot of large fish but because fish vertebrae don't hold up well in the fossil record, it's difficult to get an accurate reading. 2002, Mark Renz, Megalodon: Hunting the Hunter, page 33: