According to a friend of his that I spoke with, he uses AZ because he knows everything from A to Z.
They are the initials of a significant person in his life.
Everyones shidduch was created 40 days before yitziras havlad.
What’s your point with that? Are you saying that nobody ever died without getting married?
BTW, the source of that is Sotah 2a. See Tos’ there.