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An excerpt from www.HouseOfNames.com archives copyright © 2000 - 2014

Where did the Irish O'Callaghan family come from? What is the Irish O'Callaghan family crest and coat of arms? When did the O'Callaghan family first arrive in the United States? Where did the various branches of the family go? What is the O'Callaghan family history?

Before Irish names were translated into English, O'Callaghan had a Gaelic form of O Ceallachain, possibly from "ceallach", which means "strife". The family is descended from Ceallachan (Callaghan), the 10th century King of Munster from whom their surname is derived, and as such, the name O'Callaghan is a patronymic name.

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The general population of Ireland, like those of Europe and Britain during the Middle Ages, scribes recorded people's names as they saw fit. As a result, surnames often had many spelling variations. For O'Callaghan some of these variations included: Callaghan, Callahan, O'Callaghan, O'Callahan, Calahan, Cellaghan, Kalahan, Kallaghan, Kallahan, O'Kallaghan, Kellaghan, Kelleghan, Kellahan, Kelahan, Ceilahan, Ceilaghan, Callachan, Calachan, Callagan, Calagan, Kelagan, Callighan and many more.

First found in Munster. The earliest mention of the name O'Callaghan placed them in the barony of Kinlea, in County Cork, yet the family lost most of their original lands in the barony of Kinelea during the Anglo- Norman Conquest under Strongbow. They relocated to an area near Mallow, in the north of the county, and remained there until forced off their lands once again during the Cromwellian Invasion of the 17th century. The head family migrated to the east of County Clare and flourished, giving their name to the village of Callaghan's Mills. The resumption of the often-discarded prefix "O" has been widespread during the late twentieth century, but in the early twentieth century, Callaghans greatly outnumbered O'Callaghans, but such is no longer the case. The O'Callaghans are one of the few Irish families to still have a chief, certified by the Genealogical Office. [1]


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This web page shows only a small excerpt of our O'Callaghan research. Another 403 words(29 lines of text) covering the years 1172, 1640, 1738, 1807, 1797, 1883, 1605, 1654, 1839 and 1909 are included under the topic Early O'Callaghan History in all our PDF Extended History products.

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Another 53 words(4 lines of text) are included under the topic Early O'Callaghan Notables in all our PDF Extended History products.

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The 18th and 19th centuries saw many Irish families immigrate to North America in search of land and opportunities. The largest influx of Irish immigrants to the United States and British North America came during the 1840s when the Great Potato Famine laid waste to their homeland. Hundreds of thousands left the island in an attempt to escape the starvation and disease it brought. Although the arrival of such a large number of destitute Irish was not welcomed by the established population in the United States and what would become known as Canada at the time, these Irish were an essential element to the rapid development of these growing industrial nations. They filled the demand for the cheap labor needed for the work in factories and in the construction of bridges, roads, canals, and railways. An examination of passenger and immigration lists has revealed many immigrants bearing the name of O'Callaghan or one of its variants: James Callaghan who settled in America in 1768; Gerhard Callaghan settled in 1764; James Callaghan settled in Pennsylvania in 1772; John Callaghan settled in Boston Massachusetts in 1764.

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  • Sergeant John O'Callaghan (1868-1870), American soldier, Medal of Honor recipient
  • David O'Callaghan, Irish hurler and former Gaelic football player
  • Gareth O'Callaghan, Irish author, radio presenter and former television presenter
  • Professor Kathleen "Kate" O'Callaghan (1888-1961), Irish Sinn Féin politician and academic
  • Eugene O'Callaghan (1888-1973), Irish priest in the Archdiocese of Armagh
  • Conor O'Callaghan (b. 1968), Irish poet
  • Lt-General William O'Callaghan DSM, Irish Army officer, Commanding Officer of United Nations Interim Force in Lebanon
  • Tony O'Callaghan (b. 1956), British television actor
  • Denis O'Callaghan (b. 1949), former Australian rules footballer
  • Jamie O'Callaghan (b. 1990), English professional rugby league footballer

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  1. ^ MacLysaght, Edward, Irish Families Their Names, Arms and Origins 4th Edition. Dublin: Irish Academic, 1982. Print. (ISBN 0-7165-2364-7)

Other References

  1. Donovan, George Francis. The Pre-Revolutionary Irish in Massachusetts 1620-1775. Menasha, WI: Geroge Banta Publsihing Co., 1932. Print.
  2. Crozier, William Armstrong Edition. Crozier's General Armory A Registry of American Families Entitled to Coat Armor. New York: Fox, Duffield, 1904. Print.
  3. O'Hart, John. Irish Pedigress 5th Edition in 2 Volumes. Baltimore: Genealogical Publishing, 1976. Print. (ISBN 0-8063-0737-4).
  4. Bullock, L.G. Historical Map of Ireland. Edinburgh: Bartholomew and Son, 1969. Print.
  5. The Norman People and Their Existing Descendants in the British Dominions and the United States Of America. Baltimore: Genealogical Publishing, 1975. Print. (ISBN 0-8063-0636-X).
  6. Colletta, John P. They Came In Ships. Salt Lake City: Ancestry, 1993. Print.
  7. Chadwick, Nora Kershaw and J.X.W.P Corcoran. The Celts. London: Penguin, 1970. Print. (ISBN 0140212116).
  8. Sullivan, Sir Edward. The Book of Kells 3rd Edition. New York: Crescent Books, 1986. Print. (ISBN 0-517-61987-3).
  9. Magnusson, Magnus. Chambers Biographical Dictionary 5th edition. Edinburgh: W & R Chambers, 1990. Print.
  10. Rasmussen, Louis J. . San Francisco Ship Passenger Lists 4 Volumes Colma, California 1965 Reprint. Baltimore: Genealogical Publishing, 1978. Print.
  11. ...

The O'Callaghan Family Crest was acquired from the Houseofnames.com archives. The O'Callaghan Family Crest was drawn according to heraldic standards based on published blazons. We generally include the oldest published family crest once associated with each surname.

This page was last modified on 30 July 2014 at 14:20.

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