Crossing writes in his Guide to Dartmoor that the cairn got its name after a baby was found on Stall Moor and adopted by local people. He was given the name Hillson and after a while moved up onto the hill and built himself a house amongst the stones of the cairn. Here he made a living making clocks...out of what it doesn’t say, but it does say that a Mr Hillson who lived in Cornwood in the mid 1800s had one of these clocks.