O'Callaghn Surname

14,316,765th
Most Common
surname in the World

Approximately 1 people bear this surname

Most prevalent in:
United States
Highest density in:
United States

O'Callaghn Surname Definition:

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.

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O'Callaghn Surname Distribution Map

By incidenceBy frequencyBy rank
PlaceIncidenceFrequencyRank in Area
United States11:362,458,9331,988,048
PlaceIncidenceFrequencyRank in Area
Ireland31:1,476,62229,385
PlaceIncidenceFrequencyRank in Area
United States21:25,109,342694,541

O'Callaghn Surname Meaning

From Where Does The Surname Originate? meaning and history

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'Callaghn Demographics

O'Callaghn Religious Adherence
in Ireland

Sample size: 3 (1901)

Religious Adherence
in Ireland

View the most religious surnames in Ireland

O'Callaghn Last Name Facts

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

The surname O'Callaghn has its highest incidence in The United States. It may also occur as:. Click here for other potential spellings of O'Callaghn.

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

The surname O'Callaghn is the 14,316,765th most common surname in the world It is held by around 1 in 2,147,483,647 people. This last name occurs predominantly in The Americas, where 100 percent of O'Callaghn are found; 100 percent are found in North America and 100 percent are found in Anglo-North America.

The last name O'Callaghn is most frequently used in The United States, where it is borne by 1 people, or 1 in 362,458,933. In The United States it is most frequent in: New York, where 100 percent reside.

O'Callaghn Family Population Trend historical fluctuation

The incidence of O'Callaghn has changed over time. In The United States the share of the population with the surname declined 50 percent between 1880 and 2014.

O'Callaghn Last Name Statistics demography

The religious devotion of those bearing the last name is principally 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/
Ocallaghn951/
O'Callaghon950/
O'Callaghen950/
O'Callaghin950/
O' Callaghan91340/
O'Callaaghan915/
O'Callaghhan910/
O'Callaghane910/
Ocallaghan904,377/
O'Callagan9010/
O'Calaghan905/
Ocallaghin901/
Ocallaghen901/
O'Callghan901/
Ocallaghna901/
O Callaghan8668/
O'Gallaghan863/
Ò'callaghan861/
O'Callachan861/
Ocallacghan861/
O Callaghen860/
OcCallaghan860/
O'Cullaghan860/
O'Collaghan860/
O'Calloghan860/
O'Calleghen860/
O'Calleghan860/
Ocalaghan846/
Ocallghan844/
Ocallagan844/
Ocllaghan842/
O'Calagan840/
O' Gallaghan821/
Ogallaghan804/
Ocallachan801/
Oçallaghan801/
Ocallahagn801/
Ocalloghan800/
O Callghan800/
O'Calligan800/
Ocalagan78118/
Ocallgan780/
O Callyghan760/
O Collaghan760/
O Calleghan760/
O Calloghen760/
Ocallaghan-Hay751/
Ucalaghan741/
Ocalligan740/
O Calagan740/
Ocaleghan740/
Ocallogan740/
O'Galligan704/
O Calligan700/
Icalagan673/
O'Culachain671/
Akalagne561/
Okelagin561/
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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'Callaghn
  • 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