Show ContentsO'Cahily History, Family Crest & Coats of Arms

The original Gaelic form of O'Cahily was Mac Cathail or Ó Cathail, while is derived from the personal name Cathal, which is generally Anglicized as Charles. O'Cahily is derived from the Old Irish "catu-ualos" which means "valor or powerful in battle". 1

Early Origins of the O'Cahily family

The surname O'Cahily was first found in County Kerry and Tipperary as there are at least two distinct septs of the name. The first sept from County Kerry descend from the Heremon line of kings and were known as the Cahills of Connaught. The second sept claim descent from the Ir line of kings and were located at Corkashinny, or the parish of Templemore, Tipperary. This line further branched to the eponymous Ballycahill, Tipperary. Both branches descended from O'Connors, the Kings of Connacht, specifically "Cathal," also known as Conor na Luinge Luaithe, when anglicized means "Conor, the Swifter-Sailing Ship" 2 which may elude to the seafaring coat of arms used by the family.

Early History of the O'Cahily family

This web page shows only a small excerpt of our O'Cahily research. Another 138 words (10 lines of text) covering the years 1654, 1796 and 1864 are included under the topic Early O'Cahily History in all our PDF Extended History products and printed products wherever possible.

O'Cahily Spelling Variations

Numerous spelling variations of the surname O'Cahily exist. A partial explanation for these variants is that ancient scribes and church officials recorded names as they were pronounced, often resulting in a single person being recorded under several different spellings. Different spellings that were found include Cahill, O'Cahill, Kahill, Cawhill, Cahille, Cahil, Cahaly, Cahell, Cahel, Caughell, Kahil, Kahel, Caill, Cail and many more.

Early Notables of the O'Cahily family

Notable among the family name at this time was Flan O'Cahill, martyred in 938; Daniel O'Cahill, brother of Bogh O'Cahill, chief of the Clan, forfeited under the...
Another 26 words (2 lines of text) are included under the topic Early O'Cahily Notables in all our PDF Extended History products and printed products wherever possible.

Migration of the O'Cahily family

Many destitute Irish families in the 18th and 19th centuries decided to leave their homeland, which had in many ways been scarred by English colonial rule. One of the most frequent destinations for these families was North America where it was possible for an Irish family to own their own parcel of land. Many of the early settlers did find land awaiting them in British North America, or even later in America, but for the majority of immigrants that arrived as a result of the Great Potato Famine of the late 1840s the ownership of land was often a long way off. These Irish people were initially put to work on such industrial projects as the building of bridges, canals, and railroads, or they worked at manufacturing positions within factories. Whenever they arrived, the Irish made enormous contributions to the infant nations of Canada and the United States. Some of the earliest immigrants to bearer the name of O'Cahily were found through extensive research of immigration and passenger lists: Elizabeth Cahill, a bonded passenger, who arrived in America in 1735; Thomas Cahill, an "enforced emigrant" sent to America from Ireland in 1737.



The O'Cahily Motto +

The motto was originally a war cry or slogan. Mottoes first began to be shown with arms in the 14th and 15th centuries, but were not in general use until the 17th century. Thus the oldest coats of arms generally do not include a motto. Mottoes seldom form part of the grant of arms: Under most heraldic authorities, a motto is an optional component of the coat of arms, and can be added to or changed at will; many families have chosen not to display a motto.

Motto: In Domino confido
Motto Translation: I trust in the Lord.


  1. MacLysaght, Edward, The Surnames of Ireland. Ireland: Irish Academic Press, sixth edition, 1985. Print. (ISBN 0-7165-2366-3)
  2. O'Hart, John, Irish Pedigrees 5th Edition in 2 Volumes. Baltimore: Genealogical Publishing Company, 1976. Print. (ISBN 0-8063-0737-4)


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