A few centuries later, the Norse turned up and repeated the exercise, adding haugr, their word for hill. Now it was effectively Torpenhaugr - Hill Hill Hill. Then the English arrived, looked at the whole thing, shrugged, and added “Hill” on the end for good measure. Thus we ended up with Torpenhow Hill: Hill Hill Hill Hill. Over a thousand years, successive generations have been independently deciding that the previous lot hadn’t made it quite clear enough that it was, in fact, a hill.