My maternal grandparents are Nan and Pop, and my paternal grandparents are Grandmama and Grandpa. My great-grandmother is Gee Gee to almost everyone, and my great-grandfather was Paw Paw when he was alive. One of my great-grandmothers died when I was five… I think I called her Granny but I don’t remember.
My mom has already declared Gemma to be her “grandma name.” 
My grandparents were [name_f]Nanna[/name_f] and Poppa (English grandparents) and Granny and Grampa. My parents are called Baka (sp?) (pronounced Bah-kah) and Grampa by my nephew. He couldn’t say grandma, and for some reason just started calling my mom Baka, and it stuck. When we have children, I think my parents will just be Grandma and Grandpa, as will my husband’s parents be. I would have loved for my mom to be [name_f]Nanna[/name_f], but she isn’t fond of that grandparent name.
I call my grandparents Gramma and Grandpa on one side and just [name_f]Nani[/name_f] on the other side.
I remember my mom saying she would like to be called [name_f]Nana[/name_f] when she becomes a grandmother.
We called my great grandparents by [name_f]Nanny[/name_f]/Grandma and then their first name. They were [name_f]Nanny[/name_f] [name_f]Grace[/name_f] and Grandma [name_f]Alice[/name_f].
My maternal grandparents were was Gigi & Gramps.
Maternal great grandparents were Nami and Popo (said like nam-EE and POP-oh).
My paternal grandparents were Grandma & Grandpa Surname.
Dom calls my mother “Gamma” my father “Grampa” and my step dad “Papa John” lol.
He also couldn’t pronounce his aunt’s name (Nikki) so he renamed her NayNay and it stuck.
I called my grandma and grandpa Mawmaw (said mam-ow) and Moose. My niece and nephew call my mother Memaw, and their other grandma [name_f]Mimi[/name_f]. They call their grandfather Pawpaw. I imagine my kids will call my mother Memaw, and I’m not sure what they’ll call my husband’s mother (I guess we’ll let her decide). My father-in-law insist on being called by his first name though.
My maternal grandparents are Granny and Grandpa (but pronounced Grampa) and my paternal grandparents are [name_f]Nanny[/name_f] and Granda.