Hennessy Family History

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Hennessy Name Meaning

Irish: reduced form of O’Hennessy, an Anglicized form of Gaelic Ó hAonghusa ‘descendant of Aonghus’ (see Angus, and compare McGinnis).

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

Similar surnames: Fennessy, Heaney, Hennelly, Kennedy, Hennessey, Hennesy, Fennelly

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Hennessy Ethnicity Estimate

What are the common regions with the Hennessy name?

These results combine data from everyone in the AncestryDNA® database with the last name Hennessy. The Ancestry® ethnicity regions shown are top five most common on average for these people.

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  • Ireland & Scotland


  • England & Wales


  • Germanic Europe


  • Eastern Europe & Russia


  • France


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Hennessy Family Origin

Where is the Hennessy family from?

Hennessy Family Occupations

What did your Hennessy ancestors do for a living?

In 1881, a less common occupation for the Hennessy family was Clerk. Farmer, Laborer and Going To School were the top 3 reported jobs worked by Hennessy. The most common Hennessy occupation in Canada was Farmer. 25% of Hennessy's were Farmers.

View Census data for Hennessy | Data not to scale

  • Farmer

  • Laborer

  • Going To School

  • Clerk


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

Hennessy Historical Records

What Hennessy family records will you find?

Census Record

There are 90,000 census records available for the last name Hennessy. Like a window into their day-to-day life, Hennessy census records can tell you where and how your ancestors worked, their level of education, veteran status, and more.

Search 1881 Canadian census records for Hennessy

Passenger List

There are 19,000 immigration records available for the last name Hennessy. Passenger lists are your ticket to knowing when your ancestors arrived in Canada, and how they made the journey - from the ship name to ports of arrival and departure.

View all Hennessy immigration records

Draft Card

There are 14,000 military records available for the last name Hennessy. For the veterans among your Hennessy ancestors, military collections provide insights into where and when they served, and even physical descriptions.

View all Hennessy military records

You've only scratched the surface of Hennessy family history.

Hennessy Life Expectancy

What is the average Hennessy lifespan?

Between 1941 and 2004, in the United States, Hennessy life expectancy was at its lowest point in 1944, and highest in 1991. The average life expectancy for Hennessy in 1941 was 57, and 77 in 2004.

View Social Security Death Index (SSDI) for Hennessy

An unusually short lifespan might indicate that your Hennessy 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.

Famous Hennessy Family Ancestors

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