"Avi!" that was the nickname his twin sister called him when they were small. That was enough of a name for Avi (pronounced Ah-Vee) Wortis then, and it's still the name that he writes under today.
Avi came from a family who were passionate about radical politics and the arts. Family members in New York and Boston argued all the time, but in a loving way, so any dinner table discussion might turn into a free-for-all of exciting ideas.