From Irish Pedigrees; or the Origin and Stem of the Irish Nation by John O'Hart
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Armorial Bearings: Same as those of "Lynch." (ante), page 102.
AONGUS, a brother of Eochaidh Ball-dearg who is No. 94 on the "O'Brien" (Princes of Thomond) pedigree, was the ancestor of this branch of that family. The family derives its name from Longseach ("longseach:" Irish, a mariner), a descendant of that Aongus; and were after him called O'Loingsigh, or, anglicé, O'Lynch, and Lynch. It would appear that the "O'Lynches' Country" was that portion of territory lying around Castleconnell, in the barony of Owny and Ara, with portion of the lands comprised in the county of the City of Limerick.
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NOTE
* O'Lynch: In the Linea Antiqua, it is stated that William le Petit was the progenitor of all the Lynches of Ireland; who are mentioned as one of the families of "The Tribes of Galway." There was in Tirowen another "Lynch" family of Irish origin.