I would bet there's a large number of people who know Harold more than the others :)
I would have said Ghandi... though polling suggests it's actually Queen Elizabeth II.
That's interesting. Her face is on a lot of paper currency, I'm sure that contributes to her recognition.
That was originally the way money equalled fame. Also time in many monarchies was tied to the biography of the monarch. In Japan it was so, the Meiji period. In Matthew Mark Luke and John, KJV.