My daughters invented "Muggy" for me and "Dad" for their father. My granddaughter kept "Muggy" for me and all her friends and their families call me that. I've even allowed a very dear friend, who told me I felt to her like the grandmother she never had, to call me "Muggy". My husband refused to come up with a name, and for as long as he lived, he was "FraPa" to his granddaughter. These names will always be special to me.