Well, from the time I could talk to the time I was 4, my maternal g-ma was Eega. Heaven knows why.
My other g-ma was Porcupine (pronounced porkapine)Gramma. She has had the same hairstyle since before I was born, and, well, she spikes it all towards the top, and it doesn't move, so my little 4 yr old mind said porkapine.
On a different note, I have always called my aunt Tia. She's fluent in Spanish, and half the time seems that she would prefer to speak it!
My grandmother is Jajo (Jay-joe) . . . Grandfather, Papo. (Pop-oh)
Great grandparents were Mano and Popo. Great Aunts are Nini and Pito to their grandchildren, and if my siblings and cousins have children, their grandmothers' names will be Dobie, Dinka, and Beebah . . . no clue about the grandfathers' yet. The rule is that "grandparent" cannot be used in any of it's forms, not even in other languages, because as soon as you're a grandparent you're old, and my family does not let our members get old . . . and anyway, everyone calls each other by the nick names anyway, which always originate with a young family member who can't pronounce the names correctly. I'm Didden.
My grandparents on the less nick name oriented side of the family were simply called grandmom and grandad (insert last name). I always thought it was weird they didn't have nicknames.
My mom is Grandma. DH's mom that raised him was Memaw (With a short "e"). His birthmom is Dar-Dar. Her name is Darlene, and it stuck. She loves it. She says she's like Tigger...she's the only one!
My dad is Grandpa, and DH's dads are Paw-paw Walt and Paw-paw Ricky. "Dar-Dar's mom is Grandmother. I haven't got my name picked out, yet, but I better figure it out soon! He's 2 weeks old today!
My children called my mother, Granny. When my daughter got pregnant, she asked me what I wanted to be called. I told her I couldnt be Granny because that had been my mother. I told her I liked Nana but then I was told I couldnt be Nana because that was son in laws mother.
So I just dropped it for awhile. When Luke was born, they had to stay with us a few months until the loan on their house came through. He has colic. So I would walk the floor with him and sing this little ditty that included the words tima rinka dinkadoo. SOO that is where Dinkadoo came from. So now my 3 yr old grandson calls me Dinka...
My sister and I called all of our Grandmothers and Great-Grandmothers "grandma" except for my Daddy's step-mother. We call her Nanny Jane. Don't know exactly why.
My parents are Mee-maw and Pop-paw. When my brother, John, became a grandfather, he refused to choose a name, so somebody jokingly called him Papa John - like the pizza place. The name stuck, and now his 2.5-year old granddaughter loves her Papa John. LOL!