Is Trey a nickname for being a 3rd in your area?

Posted by HurtsCauseItMatters@reddit | AskAnAmerican | View on Reddit | 340 comments

Growing up in Louisiana and through adulthood, I've known a ton of people named Trey. Most of them were common acquaintances so it never occured to dig into their name too much.

A few years ago I learned that for most of those folks Trey is simply a nickname for being a 3rd in the family. I know Trey is also a stand alone name on its own as well but is the nickname thing something people do in other areas of the US or is it just a Louisiana/gulf south/South tradition as a result of the francophone background?