Well, my name's Megan, and here are some things I (or other Megans I know) get called;
Meg
Megs
Meggie
Meggie-poo
Meggers
Meggles
Meg the keg
Nutmeg
Meganeganeganator
Megaton
Nagem (Megan backwards, but also sounds like an insult..)
M
Megosaur
Megaboo
Megaroo
Megnut
Meganly
Meagan (pronounced ME-gan)
Maygen
Me-me
Meep
Mayhaan
Meex
Megpops
miagi
Megan Gilbert goes by Megan Ann.
Megan Barber goes by Megan Kelly Barber.
Megan Hescock goes by Moog.
Megan Schultz goes by Meg.
Megan Lang goes by Meg.
Megan Jossa goes by Meg.
Megan Raich goes by Meggie.
Megan Munro goes by Meg.
Megan McKinnon goes by Meg.
Megan Finney goes by Megge.
Megan Magdalene goes by Megs, and Red.
Megan Salmans goes by Mimi, and Gem.