Dolly, because I think it's cute in a retro sort of way, whereas
Dottie would just make me think
Dorothea was not too bright or absent-minded.
Roz because it's edgy and I love the sound of it.
Rosie isn't too bad, really, just boring to me. It also makes me think of someone overweight, due to a personal association.
Rosamond is very pretty. I love most
Rose names, they seem very romantic to me.