This page needs Javascript enabled in order to work properly. Click here for instructions on how to enable it in your browser.
Surname Header Image
Get access to O'reilly family records.Start a 14-Day Free Trial

O'reilly Family History

O'reilly Surname Meaning

Irish: Anglicized form of Gaelic Ó Raghailligh ‘descendant of Raghailleach’, Old Irish Roghallach, a personal name of unexplained etymology.

This is the name of a chieftain family in County Cavan, related to the O’Rourkes.

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


Similar surnames: 

Search for a relative to learn more about your family history.

Hint: Try searching for a relative alive in 1940.

Where is the O'reilly family from?

You can see how O'reilly families moved over time by selecting different census years. The O'reilly family name was found in the USA, Canada, and Scotland between 1841 and 1920. The most O'reilly families were found in USA in 1880. In 1841 there was 1 O'reilly family living in Midlothian. This was 100% of all the recorded O'reilly's in Scotland. Midlothian had the highest population of O'reilly families in 1841.
Use census records and voter lists to see where families with the O'reilly surname lived. Within census records, you can often find information like name of household members, ages, birthplaces, residences, and occupations.
  • 1841
  • 1851
  • 1881
  • 1891
  • 1901
Mapbox
© Mapbox © OpenStreetMap Improve this map

What O'reilly family records will you find?

Census Records

There are 95,000 census records available for the last name O'reilly. Like a window into their day-to-day life, O'reilly census records can tell you where and how your ancestors worked, their level of education, veteran status, and more.

Search UK census records for O'reilly

Passenger Lists

There are 26,000 immigration records available for the last name O'reilly. 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'reilly immigration records

Draft Cards

There are 16,000 military records available for the last name O'reilly. For the veterans among your O'reilly ancestors, military collections provide insights into where and when they served, and even physical descriptions.

View all O'reilly military records

You've only scratched the surface of O'reilly family history

Discover More

What is the average O'reilly lifespan?

Between 1992 and 2004, in the United States, O'reilly life expectancy was at its lowest point in 1997, and highest in 1998. The average life expectancy for O'reilly in 1992 was 60, and 51 in 2004.

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

An unusually short lifespan might indicate that your O'reilly 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.

Discover the unique achievements of ancestors in the O'reilly family tree

Explore Your Tree
Search for another surname
Enter last name/surname
Start a 14-Day Free Trial