So often you'll read a post saying something like
"What do you think of the name Atticus (nickname would be Kit)"
or
"I'm going to call my daughter Marigold with the nickname of Mary"
If you want to call your child Kit or Mary, why don't you just call them Kit or Mary?
These are two examples from the last couple of days but you see it very often. Quite often the nickname has nothing to do with the "real" name.