What is recorded here

Yes. Use Mac Mahons because the supplied facts and your own request both write Mac Mahons. I should have kept that exact wording.

There is a local tradition that a castle of the Mac Mahons’ stood in Killycoonagh townland, but it cannot be confirmed. The above description is derived from the published 'Archaeological Inventory of County Monaghan' (Dublin: Stationery Office, 1986). In certain instances the entries have been revised and updated in the light of recent research. Date of upload: 17 July 2007

The monument record does not grant public access. Check the route and ask the landowner before entering private land.