What did/do you call your great grandparents?

[Kali]

13. my father's father's parents were Mamaw and Papaw (short a, like cat on first sylable)

barely met them as a child but my father and his parents used the terms for them when talking about them all my life. His mother referred to her parents as Mother and Father (and the mother died very young)

On my Mom's side I think they called her father's parents by their full names, and I do not remember them. Her mother's parents were deceased by the time I was born and Grandma called them Mother and Father.

we called my paternal grandparents Grandma first name and Grandpa last name (usually pronounced gram, rather than grand)
maternal grandparents were the same or just Gramma and Grampa - but when he was scolding us kids he would use Granddad. "Grandad doesn't want to scold you, but if your Grandmother saw you up on that windmill she would take your hide off"