Re: Jack as a nickname for John
I know some people from the northeast (Jersey, Philadelphia) who are named John and go by Jack. But these people are in their 70's. And they'd talk about how they were the third or fourth John in their family who went only by Jack. I assumed it was a weird old-people thing. It doesn't make a lot of sense to me. They're both one-syllable J names, if someone is going to call their kid "Jack" their whole life then maybe… name them that.