"outis" comes from the Odyssey. It's what Odysseus claimed as his name when he fooled the Cyclops, Polyphemus. My favorite translation of the Odyssey renders it as "Noman" and my sig for the first few years I was here was
"Cyclops, do you ask me my name? Well, I will tell you, and you shall give me the stranger's due, as you promised. Noman is my name; Noman is what mother and father call me and all my friends." -- The Odyssey, translated by W.H.D. Rouse
A few months after I wrote to the police about the last perp I changed to the sig line I have now. That's what Odysseus said back at home, just before he cast off the rags that disguised him as a beggar.
I had no avatar until a couple weeks ago, which I felt was ok, for an "outis." This new avatar fits with "outis" nicely as well. I took the picture in the woods behind my house.