Grennan Family History

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Grennan Name Meaning

English: variant of Gernon. Irish: reduced Anglicized form of Gaelic Ó Grianáin (see Greenan).

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

Similar surnames: Greenan, Grannan, Drennan, Brennan, Glennon, Ronan, Neenan, German

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Grennan Family Origin

Where is the Grennan family from?

Grennan Family Occupations

What did your Grennan ancestors do for a living?

In 1880, Farmer, Laborer and Cooper were the top 3 reported jobs worked by Grennan. The most common Grennan occupation in the USA was Farmer. 26% of Grennan's were Farmers. A less common occupation for the Grennan family was House Keeping.

View Census data for Grennan | Data not to scale

  • Farmer

  • Laborer

  • Cooper

  • House Keeping


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

Grennan Historical Records

What Grennan family records will you find?

Census Record

There are 7,000 census records available for the last name Grennan. Like a window into their day-to-day life, Grennan 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 Grennan

Passenger List

There are 1,000 immigration records available for the last name Grennan. 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 Grennan immigration records

Draft Card

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

View all Grennan military records

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

Grennan Life Expectancy

What is the average Grennan lifespan?

Between 1957 and 2004, in the United States, Grennan life expectancy was at its lowest point in 1960, and highest in 1986. The average life expectancy for Grennan in 1957 was 60, and 75 in 2004.

View Social Security Death Index (SSDI) for Grennan

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

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