Show ContentsCoolahan Surname History

The surname Coolahan comes from two different old Irish septs, the Mac Uallachain and the Ó Culachain. The Mac Uallachain sept has been prominent in the parish of Lusmagh in the barony of Garrycastle in County Offaly, and sometimes were lords of the neighboring part of County Galway once known as Sil Anmchadha. The Ó Culachain sept belonged to the Hy Fiachrach group around Carra in County Mayo. 1

Early Origins of the Coolahan family

The surname Coolahan was first found in Counties Offaly, Galway, and Mayo. In County Mayo, Diarmid Ó Culachain (b.1221) was a professor of history and the scribe of the mass-books of Knock and Aghagower.

Early History of the Coolahan family

This web page shows only a small excerpt of our Coolahan research. The year 1617 is included under the topic Early Coolahan History in all our PDF Extended History products and printed products wherever possible.

Coolahan Spelling Variations

Spelling variations of this family name include: Cuolahan, Coolahan, Coolihan, Coolehan, Coulehan, Coolican, Cuolaghan, Ó Cuolahan, Mac Cuolahan and many more.

Early Notables of the Coolahan family

Another 35 words (2 lines of text) are included under the topic Early Coolahan Notables in all our PDF Extended History products and printed products wherever possible.


United States Coolahan migration to the United States +

Some of the first settlers of this family name were:

Coolahan Settlers in United States in the 19th Century
  • Bridget and John Coolahan, who arrived in Philadelphia in 1848
  • Mary Coolahan, who immigrated to New Orleans in 1851
  • Edward Coolahan, who arrived in Philadelphia in 1851
  • Thomas Coolahan, who landed in New York in 1867

Canada Coolahan migration to Canada +

Some of the first settlers of this family name were:

Coolahan Settlers in Canada in the 19th Century
  • Miss. Maria Coolahan, aged 7 who was emigrating through Grosse Isle Quarantine Station, Quebec aboard the ship "George" departing 13th April 1847 from Liverpool, England; the ship arrived on 12th June 1847 but she died on board 2
  • John Coolahan, who was recorded in the census of 1871 in Toronto, Ontario

New Zealand Coolahan migration to New Zealand +

Emigration to New Zealand followed in the footsteps of the European explorers, such as Captain Cook (1769-70): first came sealers, whalers, missionaries, and traders. By 1838, the British New Zealand Company had begun buying land from the Maori tribes, and selling it to settlers, and, after the Treaty of Waitangi in 1840, many British families set out on the arduous six month journey from Britain to Aotearoa to start a new life. Early immigrants include:

Coolahan Settlers in New Zealand in the 19th Century
  • Hugh Coolahan, who landed in Auckland, New Zealand in 1843


  1. MacLysaght, Edward, Supplement to Irish Families. Baltimore: Genealogical Book Company, 1964. Print.
  2. Charbonneau, André, and Doris Drolet-Dubé. A Register of Deceased Persons at Sea and on Grosse Île in 1847. The Minister of Canadian Heritage, 1997. ISBN: 0-660-198/1-1997E (p. 70)


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