2000
#5,185
National surname rank
Recorded bearers 6,192
First available Census row
Per 100,000 2.30
Rare Last name
Obryan
Anglicized form of the Irish surname Ó Briain, meaning "descendant of Brian," a name of uncertain origin.
According to the 2020 US Census Bureau surname tables, roughly 7,054 Americans carry the last name Obryan. That puts it at #5,466 in the national surname ranking, appearing at a frequency of 2.06 per 100,000 people (about 1 in 48,590 residents).
This page is the full Name Census profile for the Obryan 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 Obryan with 1881 census detail, origin facts and modern UK distribution where available.
Bearers in the US
7.1K
1 in 48,590
Census rank
#5,466
2020 decennial data
Per 100,000
2.1
Frequency rate
Recorded bearers
6.2K
rare in the US
Popularity narrative
The Census Bureau recorded 6,151 bearers of the surname Obryan in its 2020 decennial surname file. At a rate of 2.06 per 100,000 residents, it holds the 5466th position in the national surname ranking.
Among Census respondents with the surname Obryan, the largest self-reported group is White at 90.6%. The next largest groups are Two or More Races (3.4%) and Hispanic (3.3%).
Origin
Meaning and origin of Obryan
The surname O'Bryan originated in Ireland and is a variant of the more common Irish surname O'Brien. The name can be traced back to the 10th century and is derived from the Irish Gaelic Ó Briain, meaning "descendant of Brian."
The O'Briens were one of the most powerful and influential families in medieval Ireland, tracing their ancestry to Brian Boru, the High King of Ireland who reigned from 1002 to 1014 AD. Brian Boru was renowned for his military victories against the Vikings and his efforts to unify Ireland under his rule.
The O'Briens were based in the region of Munster, particularly in County Clare and County Limerick. They were kings and lords of Thomond, a historic territory that encompassed parts of these counties. The O'Bryans were a cadet branch of the O'Brien dynasty and held lands in the same general area.
One of the earliest recorded instances of the O'Bryan surname can be found in the Annals of Inisfallen, a chronicle of medieval Irish history. In the year 1317, the annals mention "Donal O'Bryan" as a leader who was involved in a conflict with the Earl of Ulster.
In the 16th century, during the Tudor conquest of Ireland, several members of the O'Bryan family are mentioned in historical records. One notable figure was Donough O'Bryan, who was executed in 1581 for his involvement in the Second Desmond Rebellion against English rule.
Another prominent individual with the surname was William O'Bryan (1778-1868), an Irish-American Catholic priest who was a pioneer of the Vincentian order in the United States. He established several churches and charitable organizations in the St. Louis area.
In the 19th century, Michael O'Bryan (1804-1887) was a prominent Irish-American businessman and politician in Detroit, Michigan. He served as the city's mayor from 1857 to 1859.
William Jennings O'Bryan (1860-1940) was an American lawyer and politician from Nebraska. He served as a United States Representative from 1899 to 1909 and was known for his support of progressive policies and labor rights.
Flora O'Bryan Keyes (1891-1977) was an American artist and illustrator who was particularly known for her portraiture and landscape paintings. She studied at the Art Students League in New York and had a successful career spanning several decades.
Demographics
Ancestry and ethnicity for Obryan
Among Census respondents with the surname Obryan, the largest self-reported group is White at 90.6%. The next largest groups are Two or More Races (3.4%) and Hispanic (3.3%).
The bar chart below shows how Obryan 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 Obryan surname at the time of the 2020 Census, not any inherent property of the name itself.
- White90.6% · 5,570
- Two or more races3.4% · 209
- Hispanic or Latino3.3% · 204
- Black or African American1.8% · 112
- Asian and Pacific Islander0.5% · 31
- American Indian and Alaska Native0.4% · 25
Timeline
Historical Census data for Obryan
Obryan 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
#5,433
National surname rank
Recorded bearers 6,408
+216 bearers (+3.5%)
Per 100,000 2.17
Rank movement Down 248 places
2020
#5,466
National surname rank
Recorded bearers 6,151
-257 bearers (-4.0%)
Per 100,000 2.06
Rank movement Down 33 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #5,185 | 6,192 | 2.30 | First available Census row | First available Census row |
| 2010 | #5,433 | 6,408 | 2.17 | +216 bearers (+3.5%) | Down 248 places |
| 2020 | #5,466 | 6,151 | 2.06 | -257 bearers (-4.0%) | Down 33 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 Obryan 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 | #5,433 | #5,466 | -0.6% |
| Count | 6,408 | 6,151 | -4.0% |
| Per 100K | 2.17 | 2.06 | -5.2% |
Between the 2010 and 2020 Census, the number of Obryan bearers went from 6,408 to 6,151 (-4.0% change). The surname moved down 33 positions in the national ranking, going from #5,433 to #5,466.
FAQ
Obryan surname: questions and answers
How many people in the U.S. have the surname Obryan?
Name Census estimates that about 7,054 living Americans carry the surname Obryan. Using the current population baseline, that works out to roughly 1 in 48,590 residents.
How common is Obryan?
Obryan ranks #5,466 in the 2020 Census surname tables and is classified on this site as "Rare." The Census recorded the name at a frequency of 2.06 per 100,000 residents, which is about 2 people out of every 100,000.
How many people with this surname were counted in the Census?
The raw 2020 Census file counted 6,151 people with the surname Obryan. That is different from the site's living-bearer estimate (7,054), which projects the surname's present-day count by applying the Census frequency rate to the current U.S. population.
What does 2.06 per 100,000 actually mean?
It is the Census Bureau's normalized frequency measure. A rate of 2.06 per 100,000 means that if you picked a random group of 100,000 U.S. residents, you would expect about 2 of them to have the surname Obryan.
Has Obryan become more or less common over time?
Between 2010 and 2020, the surname Obryan went from 6,408 recorded bearers to 6,151. That is a decrease of 257 (-4.0%). In the national ranking it fell from #5,433 to #5,466.
What does the Census say about the background of Obryan?
Among Census respondents with the surname Obryan, the largest self-reported group is White at 90.6%. The next largest groups are Two or More Races (3.4%) and Hispanic (3.3%). 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 Obryan in the 2020 Census, accounting for 90.6% (5,570 people in the source table).
What is the full ancestry breakdown?
Obryan appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (90.6%), Two or More Races (3.4%), Hispanic (3.3%). 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 Obryan (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 Obryan mean?
Anglicized form of the Irish surname Ó Briain, meaning "descendant of Brian," a name of uncertain origin. 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 Obryan (2.06 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 are called Obryan?
For a quick modern take, check how common the surname Obryan is on our sister site HowManyOfMe.org.