No not at all it is a cute name. Also it holds so much meaning for your family :)
What about a similair name like maybe Erin?
Ernstein reminds me of those Ernest movies. maybe something more girly? idk just my opinion. i named my daughter Alexis Rose...and my son will be named Jason James...but im more of a "todays" kinda name liker :P
Lol Yeah not sure why but I've always liked older names. I think because they're more uncommon these days.
I love the name! Keep it. Especially since it has so much meaning to you. My daughters middle name is the same as my nanas. I named it after her, just happens to be my middle name as well.
It's hard to not want to use the name Ernestine for me though because my grandmother is my hero. She has sacrificed everything to raise all of her 7 grandkids. I just wish her middle name was a little "cooler" lol
This will be her first great granddaughter(my cousin and I both have boys already) and I know she would just be blown away that I want to name my girl after her. She's always worrying that when she dies no one is going to remember her. So I think this would be pretty cool for her.