As a surname, Nally is a form of McNally, which is from Gaelic
Mac an Fhailghigh, which meant "son of the poor man". This is the explanation given in both MacLysaght's
The Surnames of Ireland and Hanks & Hodges'
Dictionary of Surnames.
Irish Names by O Corrain & Maguire has Irial as a form of Irél, a name from Irish legend (the son of "the great Ulster warrior
Conall Cearnach"). Evidently no etymology is known beyond that.
This message was edited 4/20/2009, 2:03 PM