the name of two baronies of Ireland, in the county of Down, and province of Ulster. They are distinguished into Upper and Lower Ivecach, and the former is by much the largest barony in that county. The name of Ivecach, or Hy Veach, is said to be taken from Achains, in Irish called Eachach, grandfather to king Coaltipaig, as much as to say "the territory..." territory of Eachach;" for by, in the Irish language, is a common adjective, denoting not only the heads and founders of families, but also the territories possessed by them. Ivecach (including both baronies) was otherwise called the Magennis country, and in queen Elizabeth's time was governed by Sir Hugh Magennis, esteemed to have been one of the most polite of all the natives in those parts. Through part of this barony runs a chain of mountains considerably high, known by the name of Ivecach mountains.

Iuernus (anc. geogr.), a town in the south-west of Ireland. Now Dunkeran, (Camden) called Donekyne by the natives, situated on the river Maire, in the province of Munster.