Other Forms of the Name with authority source (if provided) in italics:
Recte. Derg Emlagh
Derrygimlagh By. Surveyors Sketch Map
Derrygilagh C. C. Collector
Derrygimlagh Co. Map
Derrygimlagh Rev. Peter Fitzmorris, P.P.
Proprietor Thomas Martin, Esq., M.P., Ballinahinch. Agents. Messers Guinness and Berwick, Dublin. Rent £320 per year. No lease. Soil rocky having a great deal of bog. Co. Cess 20¼d. paid half yearly for each of – acres. Produces middling crops of oats and potatoes. 4 villages:- Daley Hill, Carroo-an-emla, Bolla-fodtha and Cnuckaun-na-mre-gaun, Emlaghnacoonla an arable hill, Ard Illaun, Lough-a-thaula, Mill Lough, Kygla Bridge, Urriseasky, Illaun-Baurown, Stair Island or Illaun-na-Dhridh-oga. Emlagh an arable hill having ruins of a house thereon. Lough-na-molee-baun-na near Boolagair. Lough-an-illaun, Lough-yun-nagh-rue. Lough-na-gop. R. C. Chapel, Barrick, Manning Bay, North of townland. Brean-Lough crosses road and falls into Manning Bay. Road to Clifden and Aillebrack old road to Trusky old road to Roundstown. Lough Fodtha.
A central townland in the West side of the parish bounded on the North by townlands Ardagh, Ballinboy and Mannin Bay, West by Mannin Bay, Manninmore townland and Loughanasert, South by Ballyconneely, Shannanagower and Boolagair townlands and on the East by Slieve Bourke and Beaghcauneen.