Bo Jackson.
I remember visiting my sister when she was a student (1983-1985, not exactly which year).
We were driving around campus as she showed me different things and places and I would see cars that had writing on their windows saying "GO BO" "RUN BO RUN", etc. I was thinking who the heck is Bo? (I was almost exclusively into the NFL at that time.) Needless to say, it didn't take me long to know who Bo was.