petemar1 = Marc Peters
The designation "petemar1" comes from the user naming system defined by the Illinois Institute of Technology. The rule was: produce a seven-letter username from the first 4 letters of the last name, and the first 3 letters of the first name. If the username already exists, then add a numeral to the end of the username, beginning with "1" for the second user with the same name, "2" for the third user with the name, "3" for the fourth, and so on. Thus, "Marc Peters" becomes "petemar1," the second user to hold the "petemar" designation.
I am not the first, nor am I the last.