O'Calaghan Surname

8,193,072nd
Most Common
surname in the World

Approximately 5 people bear this surname

Most prevalent in:
Ireland
Highest density in:
Ireland

O'Calaghan Surname Definition:

(Celtic) the Irish O’Ceallachain = Descendant of Ceallachan [v. O’-, and Callaghan]

O'Calaghan Surname Distribution Map

By incidenceBy frequencyBy rank
Incidence (high to low)Incidence (low to high)Alphabetic A-ZAlphabetic Z-ARank (high to low)Rank (low to high)
PlaceIncidenceFrequencyRank in Area
Ireland21:2,354,47019,715
Australia11:26,995,701270,794
England11:55,718,059489,080
Spain11:46,752,036156,870
United States11:362,458,9331,988,048
PlaceIncidenceFrequencyRank in Area
Ireland31:1,476,62229,385
PlaceIncidenceFrequencyRank in Area
United States91:5,579,854232,921

O'Calaghan Surname Meaning

From Where Does The Surname Originate? meaning and history

(Celtic) the Irish O’Ceallachain = Descendant of Ceallachan [v. O’-, and Callaghan]

— Surnames of the United Kingdom (1912) by Henry Harrison

This ancient family derive their origin and their surname from Ceallachan Cathel, a famous king of Munster in the tenth century. Their territory, according to Mr. D'Alton, was partly in cos. Louth and Mayo, but especially in Cork, where 50,000 acres of laud on both sides of the Blackwater, and hence called Pobble O'Callaghan, were occupied by them.

— Patronymica Britannica (1860) by Mark Antony Lower

O'CALLAGHAN: (Celtic or Gaelic.) The descendants or tribe of Callaghan, from Ciallach, prudent, judicious, discreet.

— Ludus Patronymicus (1868) by Richard Stephen Charnock
DNA test information
Display Statistics on:
  • Religious Adherence in:
    Ireland

O'Calaghan Demographics

O'Calaghan Religious Adherence
in Ireland

Sample size: 3 (1901)

Religious Adherence
in Ireland

View the most religious surnames in Ireland

O'Calaghan Last Name Facts

Where Does The Last Name O'Calaghan Come From? nationality or country of origin

O'Calaghan is found most frequently in Ireland. It may also be found as:. For other possible spellings of O'Calaghan click here.

How Common Is The Last Name O'Calaghan? popularity and diffusion

The last name is the 8,193,072nd most numerous family name on a worldwide basis, held by around 1 in 1,457,509,183 people. The last name O'Calaghan is primarily found in Europe, where 80 percent of O'Calaghan live; 60 percent live in Northern Europe and 60 percent live in British Isles.

The last name is most numerous in Ireland, where it is borne by 2 people, or 1 in 2,354,470. In Ireland O'Calaghan is primarily found in: Munster, where 50 percent reside. Barring Ireland this surname occurs in 4 countries. It also occurs in Australia, where 20 percent reside and England, where 20 percent reside.

O'Calaghan Family Population Trend historical fluctuation

The occurrence of O'Calaghan has changed over time. In Ireland the share of the population with the surname contracted 33 percent between 1901 and 2014 and in The United States it contracted 89 percent between 1880 and 2014.

O'Calaghan Last Name Statistics demography

The religious devotion of those holding the surname is predominantly Catholic (100%) in Ireland.

Phonetically Similar Names

Incidence (high to low)Incidence (low to high)Alphabetic A-ZAlphabetic Z-ASimilarity (high to low)Similarity (low to high)Prevalent jurisdiction A-ZPrevalent jurisdiction Z-A
SurnameSimilarityWorldwide IncidencePrevalency
O'Callaghan9523,529/
Ocalaghan956/
O'Calagan950/
O'Callaaghan915/
O'Callagahan913/
O'Calllaghan911/
O'Challaghan911/
O'Callaghhan910/
O'Callaghane910/
Ocallaghan904,377/
O'Callagan9010/
Ochalaghan900/
Ocalagan89118/
O'Ceallaghain870/
O'Callagham867/
Ocallagahan864/
Ocallaughan861/
Ò'callaghan861/
Ocalllaghan861/
Ocallacghan861/
O'Calloghan860/
OcCallaghan860/
O'Collaghan860/
O'Calleghan860/
O'Callaghon860/
Ocallagan844/
Ocaleghan840/
O'Ceallaighain831/
Ocallagham807/
Oçallaghan801/
Ocalloghan800/
Asalaghan743/
Ajolaghan741/
Ocallogan740/
Acalanggan701/
Okelagan6723/
O'Giollagain640/
Asalagham631/
Hasalagane6014/
Accalagoun601/
Asalagam566/
Acalogoun5311/
Akologhon531/
Accalogoun50448/
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Footnotes

  • Surnames are taken as the first part of an person's inherited family name, caste, clan name or in some cases patronymic
  • Descriptions may contain details on the name's etymology, origin, ethnicity and history. They are largely reproduced from 3rd party sources; diligence is advised on accepting their validity - more information
  • Name distribution statistics are generated from a global database of over 4 billion people - more information
  • Heatmap: Dark red means there is a higher occurrence of the name, transitioning to light yellow signifies a progressively lower occurrence. Clicking on selected countries will show mapping at a regional level
  • Rank: Name are ranked by incidence using the ordinal ranking method; the name that occurs the most is assigned a rank of 1; name that occur less frequently receive an incremented rank; if two or more name occur the same number of times they are assigned the same rank and successive rank is incremented by the total preceeding names
  • Ethnic group cannot necessarily be determined by geographic occurrence
  • Similar: Names listed in the "Similar" section are phonetically similar and may not have any relation to O'Calaghan
  • To find out more about this surname's family history, lookup records on Family​Search, My​Heritage, FindMyPast and Ancestry. Further information may be obtained by DNA analysis