Today at work I encountered a woman named Scotty, which I don't know if it's her real name or a nn. I also know of another woman named Scotty. What could Scotty be a nn for?
I do know that F. Scott Fitzgerald's daughter was also named Frances Scott and her nn was Scottie.
But in first two instances, I can only assume it's a nn and am wondering what they could be nns for.