I wanted Granny, after my own much-loved maternal grandmother, but Daughter was horrified for some reason (current fashion, maybe?) and suggested Nain, for our Welsh heritage. That horrified me, so I was happy to be Grandma. Here in the Midlands it seems most are Nanna or Nan. I was Gaga for a while (still am in one sense...), until Granddaughter could speak. When she was five I trained her to address me as "Best Grandma in the Universe", for the sole purpose of annoying my daughter, and both she and her little sister continue to write that on notes when they want something. Now they are nine and seven I've become Gma (pronounced Jee-Ma) and Grandpa of course is Jee-pa. And my own mother, introduced as Great-Grandma, immediately became simply "Great", a title she has, quite properly, insisted upon ever since!