I have a question. Is it Fall or Autumn?

My daughter had lived in Ireland for a few years. She went to College there. When it was September to November, she would say, “Isn’t FALL beautiful.”

To which an Irish friend would say, “You Americans always try to simplify things. It’s Autumn, not Fall. You see leaves FALL from the trees and you say it is FALL.”

So, I ask you… WHERE did the word Fall for Autumn come from?