I have a negative association with it because there was a boy in my kindergarten class named
Arthur who was overweight, and you don't see that many overweight five-year-olds. At least, you didn't back then. I remember when we wore our costumes to school for Halloween and
Arthur was a skeleton and when I told my father, he thought that was hilarious, a fat skeleton. So to me it's a fat boy name.
I think
Arthur's family must have moved because I don't remember him after kindergarten.