That name, Cashlaunycronaghan, translates roughly as O'Cronaghan's Castle, which raises an obvious question: what kind of castle fits into a pile of stones measuring 0.8 metres by 0.55 metres, and barely half a metre high?

The 1894 to 1895 Ordnance Survey six-inch map recorded the site under that castle name, but the structure itself is simply a compact arrangement of medium-sized stones, rectangular in both plan and elevation, placed on top of the outcrop where the townland boundary between Dromcarban to the north and Curreal to the south meets the rock. Observers in the 1840s were equally puzzled. The cairn was noted at the time as a large pile of stones heaped on top of each other, with the explicit observation that it did not appear to be the ruins of an old castle. The name, then, seems to have clung to the place through local memory or map convention rather than any architectural evidence. Whether the O'Cronaghan connection reflects the name of a family who once held or marked this boundary, or whether it is simply a local topographic label of the kind that often attaches to prominent rocks and unusual features, is not something the physical remains can answer.