Dennehy Family History

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Dennehy Name Meaning

Irish (Cork): Anglicized form of Gaelic Ó Duineachdha ‘descendant of Duineachaidh’, a personal name meaning ‘humane’.

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

Similar surnames: Kennedy, Denny, Downey, Deeney, Dennen, Fennessy, Benney, Dennett

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Dennehy Ethnicity Estimate

What are the common regions with the Dennehy name?

These results combine data from everyone in the AncestryDNA® database with the last name Dennehy. 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


  • France


  • European Jewish


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Dennehy Family Origin

Where is the Dennehy family from?

Dennehy Family Occupations

What did your Dennehy ancestors do for a living?

In 1880, the most common Dennehy occupation in the USA was Keeping House. 17% of Dennehy's were Keeping Houses. Keeping House, Clerk In Tax Office and Confectioner were the top 3 reported jobs worked by Dennehy. A less common occupation for the Dennehy family was Deck Hand.

View Census data for Dennehy | Data not to scale

  • Keeping House

  • Clerk In Tax Office

  • Confectioner

  • Deck Hand


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

Dennehy Historical Records

What Dennehy family records will you find?

Census Record

There are 12,000 census records available for the last name Dennehy. Like a window into their day-to-day life, Dennehy census records can tell you where and how your ancestors worked, their level of education, veteran status, and more.

Search 1940's US census records for Dennehy

Passenger List

There are 3,000 immigration records available for the last name Dennehy. Passenger lists are your ticket to knowing when your ancestors arrived in the USA, and how they made the journey - from the ship name to ports of arrival and departure.

View all Dennehy immigration records

Draft Card

There are 1,000 military records available for the last name Dennehy. For the veterans among your Dennehy ancestors, military collections provide insights into where and when they served, and even physical descriptions.

View all Dennehy military records

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

Dennehy Life Expectancy

What is the average Dennehy lifespan?

Between 1952 and 2004, in the United States, Dennehy life expectancy was at its lowest point in 1961, and highest in 1998. The average life expectancy for Dennehy in 1952 was 60, and 73 in 2004.

View Social Security Death Index (SSDI) for Dennehy

An unusually short lifespan might indicate that your Dennehy 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 Dennehy Family Ancestors

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