Rex Ryan, initials are RR, also stands for Rolls Royce, which are jet engines, just like Pratt and Whitney jet engines, whose initials are PW, so this nickname idea is Piss Weak. Can he just be called Rex?
Rexually Transmitted D Rex "Let's Talk About Love" Ryan How about Rex "The guy that has the Stryper Boxset" Ryan Rex "Heart Attack" Ryan? How about Rex "STFU and Win" Ryan.
Isn't the name Rex sort of like a nickname already? I think so. Therefore, his nickname should be John.