LOL! we called my grandmother’s grandma. xsteen’s bf, who is from Newtown PA, so eastern PA, calls his grandparents Nana and PupPup. we laughed at first but now that we have me them, the names fit.
Pretty much the tradition in the South was usually whatever the first grandchild called his or her grandparents. That is why Meemaw is fairly common here because it is so much like Mama. I only know one child my daughters age who calls her father Papa (poppa) but they are german so it might have something to do with that.