As per Wikipedia, the electric doorbell was created in 1831 by a gentleman named Joseph Henry. I would imagine doorbells in various forms existed way before then though. A knocker at the front door, a bell in the front door, or a good kick to the door.
I know anyone reading this blog wants to know who and when the electric doorbell was created. The Victorians created the first brass bell hop bell
But what about the name, door bell or doorbell, where did that come from? A Piece of metal attached to hinge, or others used a bell attached to a string. hence the name “door bell”