I've got a good post hoc explanation for my name. Cheiro is pronounced like the greek letters "Chi" and "Rho" which stand for the letters that begin the words "Challenge" and the word "Rating", respectively, but which look like an "X" and a "P." So when I got into a long discussion with Wulf Ratbane and others about the relationship between Challenge Ratings and XP, it seemed like my name was spookily appropriate.
-mancer, of course, is a kind of wizard in DnD, but the classical meaning had more with telling the feature. I am the DM of my group, so I determine what kind of CRs the future will bring for them, and how much XP they will get. Again, a good fit.
In what folks like to call "real life" I would tend at the letters Chi and Rho in their Christian symbolism, and look at "-mancer" as being prophetic in the Judaeo-Christian sense, rather than the fortune telling sense. But that is an aspect of me, too, as I am a member of the Roman Catholic clergy. Funny thing, that: the first character I ever played in DnD was also a cleric...
The avatar, though, I don't particularly like. I used to go with a kobold samurai, but then the name "tome archon" struck me as a nice custom title, and that's what the avatar is of. I wouldn't connect that picture with me in any symbolic sense, much less a literal one.