Yes I've heard from several places that
Zane is a form of
John. I even know a boy named
Zane specifically because his fathers name is
John (brothers are
Sean,
Ian,
Jeannot and
Yannis)
I just thought that it was interesting that the two are so similar and yet aren't connected. So I thought I would see if anyone knew about an older connection between the two.
Thanks for the help though!