Skip to content
  • Start your family tree

Origins of the O'Sullivan surname

A collage of historical images including two family portraits and a postcard of people boarding a ship

About the O'Sullivans

We have a total number of 34573 records for people with the last name O'Sullivan.

Find out more about your family in our records

or try an advanced search

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.

SS
Stuart
TrustPilot review
1 of 3

Start your family tree

Trace your family back in time. Make new discoveries and see what other Findmypast family historians in our genealogy community have discovered about the O'Sullivans.

Sign up to get started

Delve deeper into the O'Sullivan family's history

Where do most O'Sullivans live?

In 1921, most O'Sullivans 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'Sullivans

How common is your surname?

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

We have 9,830 records for the O'Sullivan surname. The oldest one dates back to 1849.

Who were O'Sullivans most likely to marry?

O Sullivans

&

Osullivans

Our Marriage record sets tell us which families married O'Sullivans.

What are the most common O'Sullivan first names?

  • John
  • Patrick
  • Mary
  • Margaret

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

Common jobs for O'Sullivans

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'Sullivans in 1921
Dressmaker

27

General Servant Domestic

18

Cook Domestic

17

Teacher

16

Tailoress

14

Common Male occupations for O'Sullivans in 1921
Porter

42

General Labourer

32

Tailor

29

Clerk

25

Milesman

25

An image of a census transcript and a picture of a dairy farmer holding two milk jugs

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

We found over 27,000 family trees with the O'Sullivan surname

Trace your family back in time and see what other Findmypast family historians in our genealogy community have discovered about the O'Sullivans.

Search for a relative in our family trees

Share your discoveries

Start your family history journey

Start free trial

Start free trial