It originates from Old English *holla* or *halan*, meaning "to shout" or "to call out."
This word later evolved into the Middle English *hollen*, which eventually became the modern "holler."
Interestingly, the word "holler" is related to the Dutch word *hollen*, which means "to run" or "to gallop." This connection suggests that the act of hollering might have been associated with the exertion of calling out while running or chasing something.
So, while the meaning of "holler" has remained consistent as a loud cry or shout, its origins go back to the Old English era and connect to the idea of calling out while running or chasing.