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An excerpt from www.HouseOfNames.com archives copyright © 2000 - 2013

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

Before Irish names were translated into English, O'Callahan 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'Callahan is a patronymic name.

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One's name was often recorded under several different spellings during the life of its bearer during the Middle Ages. Spelling variations revealed in the search for the origin of the O'Callahan family name include 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'Callahan placed them in the barony of Kinlea, in the county of 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.


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This web page shows only a small excerpt of our O'Callahan research. Another 315 words(22 lines of text) covering the years 1172, 1605, 1640, 1654, 1738, 1797, 1807, 1839, and 1883 are included under the topic Early O'Callahan History in all our PDF Extended History products.

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Another 35 words(2 lines of text) are included under the topic Early O'Callahan Notables in all our PDF Extended History products.

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In the 18th and 19th centuries hundreds of thousands of Irish people immigrated to North American shores. The early settlers were enticed by the promise of their own land, but they were moderately well off in Ireland when they decided to emigrate. Therefore, they were merely carrying out a long and carefully thought out decision. The 1840s saw the emergence of a very different trend: thousands of extremely desperate people crammed into passenger boats hoping to find any type of opportunity. The Irish of this decade had seen their homeland severely stricken by crop failures which resulted in widespread disease and starvation. At whatever time the Irish immigrants came to North America, they were instrumental in the rapid development of the emerging nations of the United States and what would become known as Canada. An exhaustive search of passenger and immigration lists has revealed many persons bearing the name O'Callahan, 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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  • John J. "Jack" O'Callahan (b. 1957), retired professional American ice hockey player
  • Joseph Timothy O'Callahan (1905-1964), American Jesuit priest
  • Commander (Chaplain Corps) Joseph Timothy O'Callahan, awarded the Congressional Medal of Honor in 1945


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  1. Read, Charles Anderson. The Cabinet of Irish Literature Selections from the Works of the Chief Poets, Orators and Prose Writers of Ireland 4 Volumes. London: Blackie and Son, 1884. Print.
  2. Hickey, D.J. and J.E. Doherty. A New Dictionary of Irish History form 1800 2nd Edition. Dublin: Gil & MacMillian, 2003. Print.
  3. O'Hart, John. Irish Pedigress 5th Edition in 2 Volumes. Baltimore: Genealogical Publishing, 1976. Print. (ISBN 0-8063-0737-4).
  4. Rasmussen, Louis J. . San Francisco Ship Passenger Lists 4 Volumes Colma, California 1965 Reprint. Baltimore: Genealogical Publishing, 1978. Print.
  5. Grehan, Ida. Dictionary of Irish Family Names. Boulder: Roberts Rinehart, 1997. Print. (ISBN 1-57098-137-X).
  6. McDonnell, Frances. Emigrants from Ireland to America 1735-1743 A Transcription of the report of the Irish House of Commons into Enforced emigration to America. Baltimore: Genealogical Publishing, 1992. Print. (ISBN 0-8063-1331-5).
  7. Weis, Frederick Lewis, Walter Lee Sheppard and David Faris. Ancestral Roots of Sixty Colonists Who Came to New England Between 1623 and 1650 7th Edition. Baltimore: Genealogical Publishing, 1992. Print. (ISBN 0806313676).
  8. MacLysaght, Edward. Irish Families Their Names, Arms and Origins 4th Edition. Dublin: Irish Academic, 1991. Print. (ISBN 0-7165-2364-7).
  9. Magnusson, Magnus. Chambers Biographical Dictionary 5th edition. Edinburgh: W & R Chambers, 1990. Print.
  10. Skordas, Guest. Ed. The Early Settlers of Maryland an Index to Names or Immigrants Complied from Records of Land Patents 1633-1680 in the Hall of Records Annapolis, Maryland. Baltimore: Genealogical Publishing Co., 1992. Print.
  11. ...

The O'Callahan Family Crest was acquired from the Houseofnames.com archives. The O'Callahan 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 17 November 2010 at 11:00.

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