I had a Grandma and Grandpa and a Grandma and Papa growing up.
My ILs are Grammy & Pops (they were grandparents before I married DH so I don't know the story behind those names) and my parents are Grandma and Grandpa. My kids also have a Great-Grandma [last name] and a Great-Grandpa [first name] on my side.
I've already decided that I'm going to be a Nana.