Don't know - couldn't find it anywhere. Since the ferrata follows an old climbing route, most likely the dude who climbed it first was called Hohl. On the other hand, Hohlweg, the direct German translation is mor like a "hollow road", used for deep cut roads. However, I don't really see a connection here.
"So I was sitting in my cubicle today, and I realized, ever since I started working, every single day of my life has been worse than the day before it. So that means that every single day that you see me, that's on the worst day of my life."
--Peter Gibbons (Office Space)