Just starting to tentatively draw up lists of names.
Dh comes out with, "I really like Erin, and we could always use Catherine on the birth certificate."
He claims that Erin is a perfectly acceptable diminutive of Catherine, and that he knew a few at school. I think he's making it up/remembering wrong/these Erins played a prank on him.
In my books, Catherine can be shortened to Cathy or Katie, but not to Erin??