Grandma wants baby to call her weird name

Is it weird that my mom wants my baby to call her (pronounced) “mooma” really spelled “moma” on her christmas gifts she gave my baby. I just feel like its so close to mama. At first she wanted my baby to call her mommy and im like im mommy and mama. I was like you’re grandma. Shes like i want another name. I dont like grandma. And then she decided on the mooma/moma out of nowhere which sounds so weird to me. My baby is almost 7months and she says dada but not intentionally yet. I asked her to stick with grandma but she wont respect my decision. She just said “lets see what she will say later then”

TLDR: Is it weird grandma wants baby to call her a weird name other than grandma ?