When I was little, Grandmas and Grandpas never had special names. They were just Grandma and Grandpa and if we needed to differentiate we used last names.
Then we moved to the east coast and were confronted with a series of me-maws and pop-pops and you name it, they're out there.
So the Grandmas (my mom and Chopper's mom) are pretty flexible about it (or say they are). But Grandpa -- well, he's put his foot down that he's going to be Grandpa and that's that.
But you know where all of those "other" names come from right? They come from those itty-bitty grandkids trying to say "Grandma" and "Grandpa" and not quite getting it right.
But a Grandpa by any other name is just as sweet right?
Wouldn't you agree "Pa-kow?"