Show ContentsO Shaughnessy History, Family Crest & Coats of Arms

Irish surnames are linked to the long Gaelic heritage of the Island nation. The original Gaelic form of the name O Shaughnessy is Ó Seachnasaigh.

Early Origins of the O Shaughnessy family

The surname O Shaughnessy was first found in County Galway (Irish: Gaillimh) part of the province of Connacht, located on the west coast of the Island.

Early History of the O Shaughnessy family

This web page shows only a small excerpt of our O Shaughnessy research. Another 101 words (7 lines of text) covering the years 1569, 1673, 1690, 1691 and 1744 are included under the topic Early O Shaughnessy History in all our PDF Extended History products and printed products wherever possible.

O Shaughnessy Spelling Variations

One explanation for the many variations is that scribes and church officials frequently spelled the name as it sounded: an imprecise method at best. Understandably then, various spellings of the surname O Shaughnessy were found in the many archives researched. These included O'Shaughnessy, Shaughnessy, O'Shanessy, Shanessy and others.

Early Notables of the O Shaughnessy family

Notable amongst the family name at this time was Ruaidhrí Gilla Dubh Ó Seachnasaigh (aka Sir Roger O'Shaughnessy) (died 1569), Irish Knight and Chief of the Name; Roger O'Shaughnessy, The O'Shaughnessy (d. 1690), Captain in the Irish...
Another 37 words (3 lines of text) are included under the topic Early O Shaughnessy Notables in all our PDF Extended History products and printed products wherever possible.

O Shaughnessy Ranking

In the United States, the name O Shaughnessy is the 9,923rd most popular surname with an estimated 2,487 people with that name. 1


United States O Shaughnessy migration to the United States +

Suffering from poverty and racial discrimination, thousands of Irish families left the island in the 19th century for North America aboard cramped passenger ships. The early migrants became settlers of small tracts of land, and those that came later were often employed in the new cities or transitional work camps. The largest influx of Irish settlers occurred with Great Potato Famine during the late 1840s. Although the immigrants from this period were often maligned when they arrived in the United States, they provided the cheap labor that was necessary for the development of that country as an industrial power. Early immigration and passenger lists have revealed many immigrants bearing the name O Shaughnessy:

O Shaughnessy Settlers in United States in the 19th Century
  • Thomas O'Shaughnessy, who settled in Philadelphia in 1854 along with Martin and James
  • Ellen O'Shaughnessy, aged 26, who immigrated to the United States from Clarina, Limerck, in 1897
O Shaughnessy Settlers in United States in the 20th Century
  • Christopher O'Shaughnessy, aged 32, who settled in America from Belfast, in 1903
  • Annie O'Shaughnessy, aged 24, who immigrated to the United States from Clara, Ireland, in 1908
  • Annie O'Shaughnessy, aged 16, who landed in America from Nabasheeda, Ireland, in 1908
  • Delia O'Shaughnessy, aged 18, who landed in America from Glin, Ireland, in 1908
  • Helen O'Shaughnessy, aged 20, who settled in America from Ballinrobe, Ireland, in 1909
  • ... (More are available in all our PDF Extended History products and printed products wherever possible.)

Australia O Shaughnessy migration to Australia +

Emigration to Australia followed the First Fleets of convicts, tradespeople and early settlers. Early immigrants include:

O Shaughnessy Settlers in Australia in the 19th Century
  • Joseph O'Shaughnessy, aged 28, who arrived in South Australia in 1849 aboard the ship "Elgin" 2
  • Joseph O'Shaughnessy, aged 28, who arrived in Adelaide, Australia aboard the ship "Elgin" in 1849 2
  • Mary O'Shaughnessy, aged 20, who arrived in Adelaide, Australia aboard the ship "Elgin" in 1849 2
  • William J. O'Shaughnessy, who arrived in Adelaide, Australia aboard the ship "Elgin" in 1849 2
  • Joseph O'Shaughnessy, who arrived in Adelaide, Australia aboard the ship "Elgin" in 1849 2
  • ... (More are available in all our PDF Extended History products and printed products wherever possible.)

New Zealand O Shaughnessy 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:

O Shaughnessy Settlers in New Zealand in the 19th Century
  • Mr. William O'Shaughnessy, (b. 1833), aged 28, Scottish farm labourer, from St Kilda travelling from London aboard the ship "Sebastopol" arriving in Lyttelton, Christchurch, South Island, New Zealand on 14th December 1861 3
  • Mrs. Mary Ann O'Shaughnessy, (b. 1834), aged 27, Scottish settler, from St Kilda travelling from London aboard the ship "Sebastopol" arriving in Lyttelton, Christchurch, South Island, New Zealand on 14th December 1861 3
  • Miss Kate O'Shaughnessy, (b. 1841), aged 21, British general servant travelling from London aboard the ship "Echunga" arriving in Lyttelton, Canterbury, New Zealand on 24th December 1862 4
  • Miss Rosanna O'Shaughnessy, Scottish settler travelling from Scotland aboard the ship "Viola" arriving in Port Chalmers, Dunedin, Otago, South Island, New Zealand on 26th July 1866 3
  • Miss Kate O'Shaughnessy, (b. 1850), aged 21, Irish general servant from County Clare, Ireland, travelling from Gravesend aboard the ship 'Merope' arriving in Lyttelton, Christchurch, South Island, New Zealand on 25th August 1871 4
  • ... (More are available in all our PDF Extended History products and printed products wherever possible.)

Contemporary Notables of the name O Shaughnessy (post 1700) +

  • Thomas O'Shaughnessy, American Republican politician, Delegate to Republican National Convention from Illinois, 1896 5
  • Maryellen O'Shaughnessy, American Democratic Party politician, Candidate for U.S. Representative from Ohio 12th District, 2000 5
  • John O'Shaughnessy, American politician, Mayor of Marlborough, Massachusetts, 1911; Defeated, 1911 5
  • Joan G. O'Shaughnessy, American Republican politician, Alternate Delegate to Republican National Convention from New York, 1972 5
  • Elim O'Shaughnessy, American politician, U.S. Vice Consul in Warsaw, 1938; Rio de Janeiro, 1939-43 5
  • Andrew O'Shaughnessy (1866-1956), Irish politician and industrialist
  • William Brooke O'Shaughnessy (1808-1889), Irish toxicologist and chemist
  • Sir Thomas O'Shaughnessy (1850-1933), the last Recorder of Dublin
  • John O'Shaughnessy (1927-2023), English academic and business writer, emeritus professor of business, Graduate School of Business, Columbia University, New York
  • Hugh O'Shaughnessy (1935-2022), Irish journalist and writer who wrote for major newspapers including The Economist, The Observer, The Independent, The Irish Times, the Financial Times and The Guardian, recipient of two British Press Awards and the 1986 Maria Moors Cabot prize
  • ... (Another 4 notables are available in all our PDF Extended History products and printed products wherever possible.)

Halifax Explosion
  • Mr. Harold  O'Shaughnessy (1917-1917), Canadian resident from Halifax, Nova Scotia, Canada who died in the Halifax Explosion (1917) 6


  1. "What are the 5,000 Most Common Last Names in the U.S.?". NameCensus.com, https://namecensus.com/last-names/
  2. State Records of South Australia. (Retrieved 2010, November 5) ELGIN 1849. Retrieved from http://www.slsa.sa.gov.au/BSA/1849Elgin.htm
  3. New Zealand Yesteryears Passenger Lists 1800 to 1900 (Retrieved 26th March 2019). Retrieved from http://www.yesteryears.co.nz/shipping/passlist.html
  4. New Zealand Yesteryears Passenger Lists 1800 to 1900 (Retrieved 17th October 2018). Retrieved from http://www.yesteryears.co.nz/shipping/passlist.html
  5. The Political Graveyard: Alphabetical Name Index. (Retrieved 2015, November 10) . Retrieved from http://politicalgraveyard.com/alpha/index.html
  6. Halifax Explosion Book of Remembrance | Maritime Museum of the Atlantic. (Retrieved 2014, June 23) . Retrieved from https://maritimemuseum.novascotia.ca/what-see-do/halifax-explosion/halifax-explosion-book-remembrance


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