Some people like to be called JT

Hi,
Do you know why heaps of men like to be called JT?

I did some research about it, and below is the only info I got.
http://www.allthebabynames.com/BabyName/nickname/initials/J.T.aspx
In the website, it indicates the meaning of the name JT,
so I'm also wondering that did their parents mean to name them to have the initial JT?

Thanks.