My grandkids call me Grandma; the 2 other grannies are called Grandmommy and Mimi
My son (49) called my Mom Golly - she used to sing Hello Dolly to him and somehow it all combined to Golly.
He wanted me to be called gollytoo by his kids - I being stupidly stubborn said no.
Notice I use Golly for everything else now.