Danagher belongs to Co.
Limerick: it originated in north-west Tipperary, where the chief was
lord of a territory near Nenagh until dispossessed following the
Anglo-Norman invasion. The Irish form of the name is given as Ó
Duineachair, but Ó Danachair may be correct. Dinagher is an
approximation of the Dennehy (Irish Ó Duineachdha), an O name. The
prefix has seldom if ever been resumed in English, seldom found
outside Counties Cork and Kerry where it is now numerous. An early
reference to the name is Donall O'Denaghie of Cloghlea, Co. Cork,
who in 1588 was described as a vestarius.