Question about "Greek Christians"

I was seeing who had the "Delta Zeta" name for a company called Cafe Press (an online printing/merchandising store) as I couldn't register for that name. What popped up was this:

http://www.cafepress.com/cp/store/st...reid=deltazeta

Has anyone here heard of the Greek Christians before? Alphaphi's name was taken too, with the same shirt design. I didn't feel like seeing who else's name had been taken by this group or person..but I imagine it's quite a few. Just curious