2000
#124,872
National surname rank
Recorded bearers 127
First available Census row
Per 100,000 0.05
Very Rare Last name
Duos
An English surname derived from the Latin word duo, meaning "two" or "pair."
According to the 2020 US Census Bureau surname tables, roughly 132 Americans carry the last name Duos. That puts it at #145,757 in the national surname ranking, appearing at a frequency of 0.04 per 100,000 people (about 1 in 2,596,624 residents).
This page is the full Name Census profile for the Duos 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.
Bearers in the US
132
1 in 2,596,624
Census rank
#145,757
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
115
very rare in the US
Popularity narrative
The Census Bureau recorded 115 bearers of the surname Duos in its 2020 decennial surname file. At a rate of 0.04 per 100,000 residents, it holds the 145757th position in the national surname ranking.
Among Census respondents with the surname Duos, the largest self-reported group is White at 91.3%. The next largest groups are Two or More Races (6.1%) and Black (2.6%).
Origin
Meaning and origin of Duos
The surname DUOS is of Spanish origin, dating back to the early 16th century. It is believed to have originated from the Basque region of northern Spain, where the name was likely derived from the Basque word "duos," meaning "two" or "a pair."
One of the earliest known references to the DUOS surname can be found in the records of the Spanish Inquisition, where a certain Pedro Duos was mentioned as a merchant in the city of Bilbao in the year 1523. This suggests that the name was already well-established in the region at that time.
In the 17th century, the DUOS name began to appear in various historical documents throughout Spain, particularly in the regions of Catalonia and Aragon. One notable example is the birth record of Juan Duos, born in Barcelona in 1651, whose family was involved in the textile trade.
As the Spanish Empire expanded across the Atlantic, the DUOS surname was carried to the Americas by early settlers and colonists. In the late 18th century, a prominent figure named Miguel Duos played a significant role in the establishment of Spanish settlements in what is now California.
Throughout the centuries, the DUOS surname has undergone slight variations in spelling, such as Duous, Duoss, and Duoz, reflecting the regional dialects and scribal practices of different areas. However, the core pronunciation and meaning of the name have remained largely unchanged.
Several notable individuals have borne the DUOS surname throughout history, including:
1. Miguel Duos (1745-1820), a Spanish military officer and explorer who led expeditions in California and the American Southwest.
2. Juana Duos (1802-1879), a renowned painter from Seville, known for her stunning portraits and religious works.
3. Tomás Duos (1856-1932), a Spanish philosopher and author who wrote extensively on ethics and metaphysics.
4. Emilio Duos (1887-1964), a prominent architect from Barcelona, responsible for designing several iconic buildings in the city.
5. Isabel Duos (1922-2005), a celebrated Spanish actress who appeared in numerous films and theater productions throughout her career.
While the DUOS surname may not be as widely recognized as some others, its rich history and linguistic roots in the Basque region of Spain make it a fascinating and significant part of the country's cultural heritage.
Demographics
Ancestry and ethnicity for Duos
Among Census respondents with the surname Duos, the largest self-reported group is White at 91.3%. The next largest groups are Two or More Races (6.1%) and Black (2.6%).
The bar chart below shows how Duos 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 Duos surname at the time of the 2020 Census, not any inherent property of the name itself.
- White91.3% · 105
- Two or more races6.1% · 7
- Black or African American2.6% · 3
Timeline
Historical Census data for Duos
Duos 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
#130,610
National surname rank
Recorded bearers 130
+3 bearers (+2.4%)
Per 100,000 0.04
Rank movement Down 5,738 places
2020
#145,757
National surname rank
Recorded bearers 115
-15 bearers (-11.5%)
Per 100,000 0.04
Rank movement Down 15,147 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #124,872 | 127 | 0.05 | First available Census row | First available Census row |
| 2010 | #130,610 | 130 | 0.04 | +3 bearers (+2.4%) | Down 5,738 places |
| 2020 | #145,757 | 115 | 0.04 | -15 bearers (-11.5%) | Down 15,147 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 Duos 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 | #130,610 | #145,757 | -11.6% |
| Count | 130 | 115 | -11.5% |
| Per 100K | 0.04 | 0.04 | -3.8% |
Between the 2010 and 2020 Census, the number of Duos bearers went from 130 to 115 (-11.5% change). The surname moved down 15,147 positions in the national ranking, going from #130,610 to #145,757.
FAQ
Duos surname: questions and answers
How many people in the U.S. have the surname Duos?
Name Census estimates that about 132 living Americans carry the surname Duos. Using the current population baseline, that works out to roughly 1 in 2,596,624 residents.
How common is Duos?
Duos ranks #145,757 in the 2020 Census surname tables and is classified on this site as "Very Rare." The Census recorded the name at a frequency of 0.04 per 100,000 residents, which is about 0 people out of every 100,000.
How many people with this surname were counted in the Census?
The raw 2020 Census file counted 115 people with the surname Duos. That is different from the site's living-bearer estimate (132), which projects the surname's present-day count by applying the Census frequency rate to the current U.S. population.
What does 0.04 per 100,000 actually mean?
It is the Census Bureau's normalized frequency measure. A rate of 0.04 per 100,000 means that if you picked a random group of 100,000 U.S. residents, you would expect about 0 of them to have the surname Duos.
Has Duos become more or less common over time?
Between 2010 and 2020, the surname Duos went from 130 recorded bearers to 115. That is a decrease of 15 (-11.5%). In the national ranking it fell from #130,610 to #145,757.
What does the Census say about the background of Duos?
Among Census respondents with the surname Duos, the largest self-reported group is White at 91.3%. The next largest groups are Two or More Races (6.1%) and Black (2.6%). 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 Duos in the 2020 Census, accounting for 91.3% (105 people in the source table).
What is the full ancestry breakdown?
Duos appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (91.3%), Two or More Races (6.1%), Black (2.6%). 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 Duos (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 Duos mean?
An English surname derived from the Latin word duo, meaning "two" or "pair." 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 Duos (0.04 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 common is the surname Duos?
See how many people have the last name Duos on HowManyOfMe.org, our sister site built around that single question.