Christopher Ziegel

Christopher Ziegel is mentioned in the second book, when Greg talks about the "last name rule". He is said to be very dumb. According to Greg, the "last name rule" is said to state if you have a last name starting with the letter "a" you will be smarter than someone with "b" "c" etcetera

Online Version
In the online book, he is the same as his book counterpart, the only difference is that his name is "Larry Ziegel"