Brennan Family History

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Brennan Name Meaning

(predominantly southern) Anglicized form of Gaelic Ó Braonáin ‘descendant of Braonán’, a personal name from a diminutive of braon ‘moisture’, ‘drop’. Compare Breen. (predominantly northern) Anglicized form of Gaelic Ó Branáin ‘descendant of Branán’, a personal name meaning ‘little raven’ (see Brannigan).

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

Similar surnames: Drennan, Greenan, Grennan, Bressan, Brenna, Grannan, Breihan, Brenton

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Brennan Family Origin

Where is the Brennan family from?


Brennan Family Occupations

What did your Brennan ancestors do for a living?

In 1880, the most common Brennan occupation in the USA was Laborer. 18% of Brennan's were Laborers. A less common occupation for the Brennan family was Miner. Laborer, Keeping House and Farmer were the top 3 reported jobs worked by Brennan.

View Census data for Brennan | Data not to scale

  • Laborer

  • Keeping House

  • Farmer

  • Miner


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

Brennan Historical Records

What Brennan family records will you find?

Census records can give you a fascinating window into the day-to-day lives of your Brennan ancestors - like hours worked per week, level of education, veteran status, employers, and more.

Search 1940's US census records for Brennan

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Brennan Life Expectancy

What is the average Brennan lifespan?

Between 1940 and 2004, Brennan life expectancy was at its lowest point in 1945, and highest in 2001. The average life expectancy for Brennan in 1940 was 40, and 74 in 2004.

View Social Security Death Index (SSDI) for Brennan


United States

An unusually short lifespan might indicate that your Brennan 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 Brennan Family

Is anyone famous hiding in your tree?

Grace Kelly1929 - 1982 (52)
John Philip Sousa1854 - 1932 (77)
Victor Hugo1802 - 1885 (83)
Ansel Easton Adams1902 - 1984 (82)
Grace Kelly1929 - 1982 (52)
John Philip Sousa1854 - 1932 (77)
Victor Hugo1802 - 1885 (83)

Amelia Earhart1897 - 1939 (41)
James Dean1931 - 1955 (24)
Audrey Hepburn1929 - 1993 (63)
Ella Fitzgerald1918 - 1996 (78)
Amelia Earhart1897 - 1939 (41)
James Dean1931 - 1955 (24)
Audrey Hepburn1929 - 1993 (63)
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