Wacky Grandparent names

So my husband's parents are very nice but really odd. For no real reason, They INSIST that their grandchildren call them Mia and Panama Jack (their names are Jane and Daniel) 🙄😂
I guess I'm a little worried that our kid will be confused when they go to school and I'm wondering if it would be rude to ask them to go by something more traditional. My husband feels the same way. It's not a big issue for my neices and nephews because they aren't attending school outside the home til high school and they aren't really socialized.
Before anyone jumps down my throat...I know this isn't a major problem and it doesn't keep me up at night 😂. I just want to see what people think...it's my first child and I always assumed she would choose.