Show ContentsRielly History, Family Crest & Coats of Arms

The Rielly surname originally appeared in Gaelic as Ó Raghailligh, which means descendant of Raghallach.

Early Origins of the Rielly family

The surname Rielly was first found in County Cavan. They were known as the Princes of East Breffny, descended from Raghallaigh, Prince of Breffny in 981. They maintained their territory during the Anglo/Norman invasion of Strongbow, Earl of Pembroke, in 1172, but Sir John O'Reilly, Prince of Breffny surrendered the principality to Queen Elizabeth I thereby ensuring that his territories remained intact.

Early History of the Rielly family

This web page shows only a small excerpt of our Rielly research. Another 95 words (7 lines of text) covering the years 1598, 1630, 1640, 1646, 1667, 1669, 1689, 1691, 1695 and 1703 are included under the topic Early Rielly History in all our PDF Extended History products and printed products wherever possible.

Rielly Spelling Variations

Just like the English language, the Gaelic language of Ireland was not standardized in the Middle Ages. Therefore, one's name was often recorded under several different spellings during the life of its bearer. Spelling variations revealed in the search for the origins of the Rielly family name include O'Reilly, O'Reilley, O'Reily, O'Rielly, O'Riely, O'Riley, O'Rilley, Reel and many more.

Early Notables of the Rielly family

Notable amongst the family name at this time was Count John O'Reilly; Edmund O'Reilly (1598-1669), Roman Catholic Archbishop of Armagh; Hugh Reily (Reilly or O’Reilly) (c.1630-1695) Irish Member of Parliament for Cavan Borough in the Patriot Parliament of 1689; Philip Og O’Reilly (Gaelic was Phillip Óg O’Raghallaigh)(c.1640-1703), Irish...
Another 48 words (3 lines of text) are included under the topic Early Rielly Notables in all our PDF Extended History products and printed products wherever possible.


United States Rielly migration to the United States +

Ireland became inhospitable for many native Irish families in the 19th centuries. Poverty, lack of opportunities, high rents, and discrimination forced thousands to leave the island for North America. The largest exodus of Irish settlers occurred with the Great Potato Famine of the late 1840s. For these immigrants the journey to British North America and the United States was long and dangerous and many did not live to see the shores of those new lands. Those who did make it were essential to the development of what would become two of the wealthiest and most powerful nations of the world. These Irish immigrants were not only important for peopling the new settlements and cities, they also provided the manpower needed for the many industrial and agricultural projects so essential to these growing nations. Immigration and passenger lists have documented the arrival of various people bearing the name Rielly to North America:

Rielly Settlers in United States in the 19th Century
  • James Rielly, who arrived in America in 1811 1
  • Elizabeth Rielly, who landed in Philadelphia, Pennsylvania in 1816 1
  • Rose Rielly, who arrived in Philadelphia, Pennsylvania in 1816 1
  • Catharine Rielly, aged 16, who arrived in New York in 1854 1
  • John Rielly, who landed in Arkansas in 1860 1

Canada Rielly migration to Canada +

Some of the first settlers of this family name were:

Rielly Settlers in Canada in the 19th Century
  • Patrick Rielly, aged 23, a sawyer, who arrived in Saint John, New Brunswick in 1834 aboard the brig "Dorcas Savage" from Belfast, Ireland

Contemporary Notables of the name Rielly (post 1700) +

  • Thomas "Tom" J. Rielly, American politician, American Iowa State Senator from the 38th district (2005-)
  • Mary Rielly, American Democratic Party politician, Delegate to Democratic National Convention from Iowa, 1972 2
  • James P. Rielly, American Democratic Party politician, U.S. Attorney for the Southern District of Iowa, 1967-69; Member of Iowa Democratic State Central Committee, 1971 2
  • Morgan Rielly (b. 1994), Canadian ice hockey defenceman from West Vancouver, British Columbia


  1. Filby, P. William, Meyer, Mary K., Passenger and immigration lists index : a guide to published arrival records of about 500,000 passengers who came to the United States and Canada in the seventeenth, eighteenth, and nineteenth centuries. 1982-1985 Cumulated Supplements in Four Volumes Detroit, Mich. : Gale Research Co., 1985, Print (ISBN 0-8103-1795-8)
  2. The Political Graveyard: Alphabetical Name Index. (Retrieved 2015, November 24) . Retrieved from http://politicalgraveyard.com/alpha/index.html


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