2000
#11,302
National surname rank
Recorded bearers 2,565
First available Census row
Per 100,000 0.95
Rare Last name
Brien
An Irish surname derived from the Gaelic Ó Briain, meaning "descendant of Brian," a personal name meaning "high" or "noble."
According to the 2020 US Census Bureau surname tables, roughly 3,024 Americans carry the last name Brien. That puts it at #11,426 in the national surname ranking, appearing at a frequency of 0.88 per 100,000 people (about 1 in 113,345 residents).
This page is the full Name Census profile for the Brien surname. You will find the Census Bureau frequency data, a multi-census history view, an ancestry and ethnicity breakdown based on self-reported demographics, the name's meaning and origin where available, and answers to the most common questions people ask about this surname.
For British records, Name Census UK has a British surname profile for Brien with 1881 census detail, origin facts and modern UK distribution where available.
Bearers in the US
3.0K
1 in 113,345
Census rank
#11,426
2020 decennial data
Per 100,000
0.9
Frequency rate
Recorded bearers
2.6K
rare in the US
Popularity narrative
The Census Bureau recorded 2,637 bearers of the surname Brien in its 2020 decennial surname file. At a rate of 0.88 per 100,000 residents, it holds the 11426th position in the national surname ranking.
Among Census respondents with the surname Brien, the largest self-reported group is White at 80.4%. The next largest groups are American Indian/Alaska Native (10.2%) and Two or More Races (4.4%).
Origin
Meaning and origin of Brien
The surname Brien has its origins in Ireland, where it is thought to have first emerged in the 12th century. It is derived from the old Gaelic word "bran," which means "raven" or "crow." This suggests that the name may have been initially given as a nickname to someone with dark hair or a swarthy complexion.
One of the earliest recorded instances of the name Brien can be found in the Annals of Ulster, a chronicle of medieval Irish history dating back to the 15th century. The annals mention a chieftain named Aedh Bren who ruled over a territory in what is now County Galway in the late 12th century.
In the 16th century, the name Brien appeared in the Fiants of the Tudor Conquest, a collection of official documents from the English conquest of Ireland. These records mention several individuals with the surname, including Dermot O'Brien, who was granted lands in County Clare in 1584.
The Brien family was particularly prominent in County Clare and County Limerick during the 16th and 17th centuries. One notable figure from this era was Connor O'Brien, the 3rd Earl of Thomond, who was born in 1534 and played a significant role in the Elizabethan wars in Ireland.
Another famous bearer of the name was William Brien, an Irish soldier and writer who was born in 1685 and served in the armies of several European countries, including France and Austria. He is best known for his memoirs, which provide valuable insights into the life of an Irish soldier of fortune in the 18th century.
In the 19th century, the Brien surname was often anglicized to "Bryan" or "Bryant," particularly among those who emigrated to English-speaking countries like the United States and Canada. One prominent individual with this spelling was William Jennings Bryan, an American politician and orator who ran for president three times and was born in 1860.
Throughout its history, the Brien name has been associated with various place names in Ireland, such as Briensville in County Westmeath and Briensborough in County Kilkenny. These localities likely derived their names from influential Brien families who resided or held lands in those areas.
Demographics
Ancestry and ethnicity for Brien
Among Census respondents with the surname Brien, the largest self-reported group is White at 80.4%. The next largest groups are American Indian/Alaska Native (10.2%) and Two or More Races (4.4%).
The bar chart below shows how Brien bearers described their own race and ethnicity on the 2020 Census form. The Census Bureau groups responses into six broad categories: White, Black or African American, Hispanic or Latino, Asian and Pacific Islander, American Indian and Alaska Native, and Two or More Races. When a category has too few respondents for a given surname, the Bureau suppresses the figure to protect individual privacy, which is why some names show fewer than six slices.
Percentages are shown for every Census year so the breakdown stays comparable over time. When the source file also includes raw headcounts, Name Census shows those alongside the percentages in the legend.
Keep in mind that these are self-reported numbers. A person's surname does not determine their race or ethnicity, and the distribution you see here reflects the specific population who happened to carry the Brien surname at the time of the 2020 Census, not any inherent property of the name itself.
- White80.4% · 2,119
- American Indian and Alaska Native10.2% · 268
- Two or more races4.4% · 117
- Hispanic or Latino3.4% · 89
- Black or African American0.9% · 25
- Asian and Pacific Islander0.7% · 19
Timeline
Historical Census data for Brien
Brien appears in 3 published Census surname files: 2000, 2010, 2020. The cards below show how the name's rank and bearer count changed across each release.
2010
#11,031
National surname rank
Recorded bearers 2,882
+317 bearers (+12.4%)
Per 100,000 0.98
Rank movement Up 271 places
2020
#11,426
National surname rank
Recorded bearers 2,637
-245 bearers (-8.5%)
Per 100,000 0.88
Rank movement Down 395 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #11,302 | 2,565 | 0.95 | First available Census row | First available Census row |
| 2010 | #11,031 | 2,882 | 0.98 | +317 bearers (+12.4%) | Up 271 places |
| 2020 | #11,426 | 2,637 | 0.88 | -245 bearers (-8.5%) | Down 395 places |
For 2020, the Census Bureau published race and Hispanic-origin columns as counts rather than percentages. Name Census converts those counts back into shares so the ancestry section stays comparable with the older surname files.
Year on year
2010 vs 2020 Census
How has the Brien surname changed between Census years? The chart shows bearer count side by side, and the table compares rank, count, and frequency.
Census year comparison
20102020
| Metric | 2010 | 2020 | Change |
|---|---|---|---|
| Rank | #11,031 | #11,426 | -3.6% |
| Count | 2,882 | 2,637 | -8.5% |
| Per 100K | 0.98 | 0.88 | -10.0% |
Between the 2010 and 2020 Census, the number of Brien bearers went from 2,882 to 2,637 (-8.5% change). The surname moved down 395 positions in the national ranking, going from #11,031 to #11,426.
FAQ
Brien surname: questions and answers
How many people in the U.S. have the surname Brien?
Name Census estimates that about 3,024 living Americans carry the surname Brien. Using the current population baseline, that works out to roughly 1 in 113,345 residents.
How common is Brien?
Brien ranks #11,426 in the 2020 Census surname tables and is classified on this site as "Rare." The Census recorded the name at a frequency of 0.88 per 100,000 residents, which is about 1 people out of every 100,000.
How many people with this surname were counted in the Census?
The raw 2020 Census file counted 2,637 people with the surname Brien. That is different from the site's living-bearer estimate (3,024), which projects the surname's present-day count by applying the Census frequency rate to the current U.S. population.
What does 0.88 per 100,000 actually mean?
It is the Census Bureau's normalized frequency measure. A rate of 0.88 per 100,000 means that if you picked a random group of 100,000 U.S. residents, you would expect about 1 of them to have the surname Brien.
Has Brien become more or less common over time?
Between 2010 and 2020, the surname Brien went from 2,882 recorded bearers to 2,637. That is a decrease of 245 (-8.5%). In the national ranking it fell from #11,031 to #11,426.
What does the Census say about the background of Brien?
Among Census respondents with the surname Brien, the largest self-reported group is White at 80.4%. The next largest groups are American Indian/Alaska Native (10.2%) and Two or More Races (4.4%). These figures come from the 2020 Census Bureau surname tables, based on how respondents described their own race and ethnicity.
Which group reports this surname most often?
White is the largest self-reported group for the surname Brien in the 2020 Census, accounting for 80.4% (2,119 people in the source table).
What is the full ancestry breakdown?
Brien appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (80.4%), American Indian/Alaska Native (10.2%), Two or More Races (4.4%). For 2020, the source file also published raw headcounts for each group, which is why this page can show both percentages and counts in the ancestry section.
Is this page using the latest Census data?
Yes. This page is using the latest surname file currently loaded on Name Census, which is 2020. The historical section above also keeps any older Census surname entries we have for Brien (2000, 2010, 2020).
Does the Census include every surname?
No. The Census Bureau only publishes surnames that appeared at least 100 times in a given decennial Census. That means very rare surnames are excluded entirely, and a surname can appear in one Census release but disappear from a later one if it falls below the reporting threshold.
Why don't the ancestry percentages always add up to exactly 100%?
There are two main reasons: rounding and suppression. The Census Bureau rounds published values, and it may suppress very small cells to protect privacy. For 2020, the Bureau also published raw group counts rather than direct percentages, so Name Census converts those counts back into shares for comparability across census years.
What does Brien mean?
An Irish surname derived from the Gaelic Ó Briain, meaning "descendant of Brian," a personal name meaning "high" or "noble." The fuller origin note on this page goes into more detail.
Where does the surname data come from?
All surname statistics on Name Census are drawn from the US Census Bureau's decennial surname frequency tables. These files list every surname that appeared 100 or more times in the 2020 Census, along with a count, a per-100,000 rate, and a self-reported demographic breakdown. You can read the full explanation on our methodology page.
How does Name Census estimate living bearers?
For surnames, Name Census does not age cohorts the way it does for first names. Instead, it takes the Census Bureau's published frequency for Brien (0.88 per 100,000) and applies that rate to the current U.S. resident population to estimate how many living Americans have the surname today.
How many people have the surname Brien?
For a faster, more casual read, check HowManyOfMe.org — our sister site built around that single question.