Meharg, Maharg
Meharg, Maharg—These two names are the shortened anglicised forms of M'Ilhargy. Other forms are M'Ilharg and McElhargy; in Gaelic the name is written Mac Giolla-Chairge, and is mostly found in Galloway and in Ulster, particularly in S.E. Derry.
Alphabetical Index of Anglicised Surnames in Ireland
See also Woulfe’s Irish Names and Surnames
… and O'Hart's Irish Pedigrees