I have been using Xepol as an alias since the early BBS days back in the 80ies. Everyone was asks what a 'Xepol' is gets the same answer : "Lopex, backwards'. Very few people are satisfied with that answer.
Xepol has been a great online name to bring forward to the internet. The X name space is very uncrowded and I have only once run into someone else trying to claim it for their own. (Accept no substitutes, I'm the real deal and have been for a LONG, LONG time.)
Google searches have, however revealed to me a few other Xepols that you might find interesting:
a Place: Xepol, Guatemala
a Polio Drug: Xepol (Human Immunoglobulin)
Of course, the same google search reveals me in many of my phases: programmer, insightful, netzien, and the ever unpopular grumpy as hell expresses his mind freely, and even the occasional foot in mouth sufferer.
So there you go, now you know what a 'Xepol' is.