Grandparents

Not only have we been given the task of naming this little (or not so little) one (it certainly doesn't seem like he'll be any kind of runt of the family!), as parents of the first grandchild on both sides, it seems that we also have some kind of responsibility for naming the grandparents too! Following some discussion of this issue with a couple of them, we realised that this decision affects all of us, and so seems slightly unfair that our siblings and parents are potentially lumbered with the names we choose without any say in the matter.
So - if any of the siblings or parents have any opinions on how they would (or particularly would not) like to be referred to by their grandchildren, say now! Will it be Nanna and Papa, Grandma and Grandpa, Granny and Grandad... All thoughts and suggestions will be considered!