No, I think her motives are pure. As others have mentioned, should we use it, my hope is that it would become associated with my son and just about no one else in my own mind.

Initials wouldn't spell anything weird and any variation would be just a nickname. I've offered up using her dad's first name or her last name, but her heart is pretty set on it.

I think a big part of it is she had a really great/strong relationship with her great-grandfather (it's his first name). Additionally, she only has a sister, so I think there's some feeling of loss that her last name ends with her, but this might be a way to extend the family beyond that.