Wow, I have to laugh at the overthinking of this entire concept. The name of someone is always taken over by their personality. Grandma Brandi will be in the Grandchild's mind their Grandma Brandi. There's nothing funny about that.
I find it pretty amusing that one day there will be Grandma's and Grandpa's with ridiculously trendy and obscene names, I'm not laughing at the person or saying that a person doesn't make the name but to me it will be odd. It will seem perfectly normal when the new generation of little ones are older.