On my dad's side: Grandma Zilkie (Zilkie is the last name) and Papa.
On my mom's side: Grandpa Philpott (Philpott is the last name) and Grandma Gray (I couldn't pronounce "Joy" when I was a baby so I'd say "Gray" and it stuck). I couldn't call her Grandma Philpott because that was my great grandma. My other great grandma was Nanny.