Historiography
This "McNerney Coat of Arms" was derived, according to Halbert's of Bath, Ohio, from information officially recorded in ancient heraldic archives: "Documentation for the McNerney Coat of Arms design can be found in Burke's General Armory."
But given the reputation of Halbert's of Bath, Ohio, it is very probably pure speculation, based mostly on phone books, and devised to fulfill a more modern market need. The Irish (and others) have been known to devise Coats of Arms for names which had no ancient coats of arms, since they were serfs rather than noblemen. Many Americans are eager to explore their roots, and pay for heritage information that is difficult if not impossible to document.
The document, supplied by Halbert's of Bath, Ohio,
which accompanies this illustration describes it, thusly:
"The surname Mc Nerney appears to be patronymical in origin, and is believed to be associated with the Irish, meaning, "son of the Erenagh (stewart of church lands)."
"Dictionaries of surnames indicate probable spelling variations. The most prominent variations of Mc Nerney are Mac Enerney, Mac Inerney, Mac Nerhenney, Mac Nirney, and Mac Nirtney."
And finally, this disclaimer appears on the Halbert's heraldic document:
"No genealogical representation is intended or implied by this report and it does not represent individual lineage or your family tree." And that is probably the most accurate statement available from Halbert's of Bath, Ohio.
Here are some resources, unfortunately, most of these are unavailable online, you will have to go down to the library to look them up:
1.Burke's peerage, Baronetage, and Knightage
2.Debrett's Peerage and Baronetage
3.The Ancestor
5.Armorial Families
6.Burke's General Armory
7.New extinct Peerage