O'callaghan Family History

14-Day Free Trial


O'callaghan Name Meaning

Irish: from Gaelic Ó Ceallacháin ‘descendant of Ceallachán’, a diminutive of the personal name Ceallach, possibly meaning ‘lover of churches’, from ceall ‘church’, or (more likely) ‘bright-headed’, from cen ‘head’ + lach ‘light’. This name was borne by a 10th-century king of Munster, from whom many present-day bearers of the surname claim descent.

Source: Dictionary of American Family Names ©2013, Oxford University Press

Similar surnames: Callahan, O'callahan, Hallahan, Callanan, Callan, Colahan, Galligan

Ready to discover your family story?

Simply start with yourself and we'll do the searching for you.

O'callaghan Family Origin

Where is the O'callaghan family from?

O'callaghan Family Occupations

What did your O'callaghan ancestors do for a living?

In 1881, a less common occupation for the O'callaghan family was Capt Rl Arty (Full Pay). The most common O'callaghan occupation in the UK was Railway Clerk. 13% of O'callaghan's were Railway Clerks. Railway Clerk, Bootmaker and Labourer were the top 3 reported jobs worked by O'callaghan.

View Census data for O'callaghan | Data not to scale

  • Railway Clerk

  • Bootmaker

  • Labourer

  • Capt Rl Arty (Full Pay)


Census records can tell you a lot of little known facts about your O'callaghan ancestors, such as occupation. Occupation can tell you about your ancestor's social and economic status.

O'callaghan Historical Records

What O'callaghan family records will you find?

Census Record

There are 46,000 census records available for the last name O'callaghan. Like a window into their day-to-day life, O'callaghan census records can tell you where and how your ancestors worked, their level of education, veteran status, and more.

Search 1891 UK census records for O'callaghan

Passenger List

There are 10,000 immigration records available for the last name O'callaghan. Passenger lists are your ticket to knowing when your ancestors arrived in the UK, and how they made the journey - from the ship name to ports of arrival and departure.

View all O'callaghan immigration records

Draft Card

There are 5,000 military records available for the last name O'callaghan. For the veterans among your O'callaghan ancestors, military collections provide insights into where and when they served, and even physical descriptions.

View all O'callaghan military records

You've only scratched the surface of O'callaghan family history.

O'callaghan Life Expectancy

What is the average O'callaghan lifespan?

Between 1992 and 2003, in the United States, O'callaghan life expectancy was at its lowest point in 1996, and highest in 1998. The average life expectancy for O'callaghan in 1992 was 45, and 54 in 2003.

View Social Security Death Index (SSDI) for O'callaghan

An unusually short lifespan might indicate that your O'callaghan ancestors lived in harsh conditions. A short lifespan might also indicate health problems that were once prevalent in your family. The SSDI is a searchable database of more than 70 million names. You can find birthdates, death dates, addresses and more.

Look up another name