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O'Brien Family History & Genealogy

3,672 biographies and 39 photos with the O'Brien last name. Discover the family history, nationality, origin and common names of O'Brien family members.
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O'Brien Last Name History & Origin

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Updated Feb 14, 2022

History

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Name Origin

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Spellings & Pronunciations

We don't have any alternate spellings or pronunciation information on the O'Brien name. Have information to share?

Nationality & Ethnicity

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Famous People named O'Brien

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Early O'Briens

These are the earliest records we have of the O'Brien family.

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O'Brien Family Tree

Discover the most common names, oldest records and life expectancy of people with the last name O'Brien.

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Most Common First Names

  • John 14.8%
  • James 7.6%
  • William 6.1%
  • Michael 5.6%
  • Patrick 5.5%
  • Thomas 5.4%
  • Edward 2.5%
  • Daniel 1.9%
  • Joseph 1.7%
  • Robert 1.7%
  • Dennis 1.6%
  • Charles 1.3%
  • Richard 1.3%
  • George 1.1%
  • Mary 1.0%
  • Francis 0.9%
  • Timothy 0.8%
  • Frank 0.7%
  • Henry 0.7%
  • Jeremiah 0.7%

Sample of 5 O'Brien Biographies

O'Brien Death Records & Life Expectancy

The average age of a O'Brien family member is 57.4 years old according to our database of 3,143 people with the last name O'Brien that have a birth and death date listed.

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Other O'Brien Records

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