It just sounds like baby talk to me. I know a couple of families where the kids call the grandmother Gigi/Gee Gee. One of these ladies is named Gisele, and the nn has spilled over so some of her friends even call her Gigi.
Before you criticize a man, walk a mile in his shoes. That way, when you criticize him, you're a mile away and you have his shoes!
Steve Martin