Where is Killorthy?

Dear sir - Greetings from the Antipodes. Recently, I have become interested in genealogy and have learned that my great grandfather Michael Joseph Kelly emigrated from Ireland to Australia in1874 with his elder brother, Luke. The passenger manifest of their ship, Jerusalem, lists their native place and county as 'Killorthy, Meath’. The usually omniscient Google is ignorant as to Killorthy, but as both lads were farmers, it may be that Killorthy was the name of a farm or grand house well known locally. I am at my wit’s end (admittedly a short journey) trying to locate Killorthy, but I am sure the collective knowledge of your readership can do better than Google in helping me in my quest. If anyone can help me in this matter, please contact me at mlohman1@optusnet.com.au Yours, Michael Joseph Lohman, 34 Fern Tree Close, Arakoon, NSW 2431, Australia.