The name Carn Clonhugh is an anglicization of the Irish Carn Clainne Aodha, meaning cairn of Clann Aodha (anglicised Clanhugh). Clanhugh was a historic territory in the northwest of County Longford. The earliest cartographic reference to the hill is found in the 1837-1842 Ordnance Survey Ireland 6 Inch map, which can be seen on the Ordnance Survey Ireland website. In cartography, the hill was referred to as Carn Clonhugh, but by the time of the 2nd edition 1887-1913 Ordnance Survey Ireland 25 Inch map, that was replaced with Corn (a corruption of Cairn) Hill. Today, it is known locally as Corn Hill.