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Origins of the O Brian surname

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About the O Brians

We have a total number of 24289 records for people with the last name O Brian.

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I’ve managed to trace back to the mid-1500s! I can’t believe it! Utterly engrossing and I have uncovered some quite moving and heartbreaking stories attached to various ancestors. You don’t need any qualifications to start - just time patience, and some information.

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Delve deeper into the O Brian family's history

Where do most O Brians live?

In 1921, most O Brians lived in London.

Census records trace your ancestors through each generation, so you can follow where your relatives lived through each decade.

Interesting facts about O Brians

How common is your surname?

You have a rare surname! It's not in the top 1000 UK surnames!

We have 10,400 records for the O Brian surname. The oldest one dates back to 1821.

Who were O Brians most likely to marry?

Our Marriage record sets tell us which families married O Brians.

What are the most common O Brian first names?

  • John
  • James
  • Mary
  • Margaret

Our birth record sets tell us the names of O Brian family members

Common jobs for O Brians

Men and women often performed different types of jobs, so these are displayed by gender to maintain their historical accuracy.

Common Female occupations for O Brians in 1921


General Servant




Domestic Servant




Common Male occupations for O Brians in 1921


General Labourer


Coal Miner


Dock Labourer


Agricultural Labourer


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Census records provide incredible detail on names, ages, marital statuses, occupations and more.

We found over 140,000 family trees with the O Brian surname

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