Apparently, a nickname given to Richard Cromwell (son of Oliver) by contemporary critics, on the grounds of his failure to hold on to power for mire than a few months. It subsequently became a pub name: I'm going to guess that its emergence as a place name in Australia came about by migrants who had frequented the pub.How do you even come up with a name like that? Did someone named "D.ick" (Richard) tumble down said hill?
(Yes, I know I'm cheating the sensor. However, I'm referring to the (nick)name "D.ick", not the body part.)