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Oallahan Family History

Oallahan Surname Meaning

Historically, surnames evolved as a way to sort people into groups - by occupation, place of origin, clan affiliation, patronage, parentage, adoption, and even physical characteristics (like red hair). Many of the modern surnames in the dictionary can be traced back to Britain and Ireland.


Similar surnames: Callahan, Hallahan, Gallahan, Callaham, Callanan, Callaghan, Allaman

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

Hint: Try searching for a relative alive in 1940.

Where is the Oallahan family from?

You can see how Oallahan families moved over time by selecting different census years. The Oallahan family name was found in the USA in 1920. In 1920 there was 1 Oallahan family living in Iowa. This was about 33% of all the recorded Oallahan's in USA. Iowa and 2 other states had the highest population of Oallahan families in 1920.
Use census records and voter lists to see where families with the Oallahan surname lived. Within census records, you can often find information like name of household members, ages, birthplaces, residences, and occupations.
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What Oallahan family records will you find?

Census Records

There are 47 census records available for the last name Oallahan. Like a window into their day-to-day life, Oallahan census records can tell you where and how your ancestors worked, their level of education, veteran status, and more.

Search Canadian census records for Oallahan

Passenger Lists

There are 7 immigration records available for the last name Oallahan. 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 Oallahan immigration records

Draft Cards

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

View all Oallahan military records

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What is the average Oallahan lifespan?

An unusually short lifespan might indicate that your Oallahan 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.

Social Security Death Index (SSDI) for Oallahan

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