2010
#154,907
National surname rank
Recorded bearers 105
First available Census row
Per 100,000 0.04
Very Rare Last name
Casaubon
A French surname potentially referring to an inhabitant of a small or new house.
According to the 2020 US Census Bureau surname tables, roughly 124 Americans carry the last name Casaubon. That puts it at #150,935 in the national surname ranking, appearing at a frequency of 0.04 per 100,000 people (about 1 in 2,764,148 residents).
This page is the full Name Census profile for the Casaubon 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
124
1 in 2,764,148
Census rank
#150,935
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
108
very rare in the US
Popularity narrative
The Census Bureau recorded 108 bearers of the surname Casaubon in its 2020 decennial surname file. At a rate of 0.04 per 100,000 residents, it holds the 150935th position in the national surname ranking.
Among Census respondents with the surname Casaubon, the largest self-reported group is White at 63.0%. The next largest groups are Hispanic (27.8%) and Two or More Races (5.6%).
Origin
Meaning and origin of Casaubon
The surname Casaubon has its origins in France, with records dating back to the early 16th century. It is believed to have originated from the Old French words "cas" meaning "case" or "house" and "aubon" meaning "auburn" or "reddish-brown." This suggests that the name may have initially referred to someone who lived in a house with a reddish-brown hue or was associated with a particular location bearing this name.
One of the earliest known references to the Casaubon name can be found in the records of the city of Nîmes, located in the Occitanie region of southern France. In the year 1528, a document mentions a certain Jean Casaubon, who was a merchant and landowner in the area. This provides evidence of the surname's existence and usage during that period.
Moving forward in time, the name gained prominence in the 17th century with the birth of Isaac Casaubon (1559-1614), a renowned French classical scholar and philologist. He was highly respected for his work in editing and translating ancient Greek and Latin texts, and his contributions to the field of classical studies were significant. Casaubon's expertise and reputation earned him positions as the Royal Librarian to King Henry IV of France and later as a professor at the University of Montpellier.
Another notable figure with the Casaubon surname was Méric Casaubon (1599-1671), the son of Isaac Casaubon. Méric followed in his father's footsteps and became a renowned scholar and theologian in his own right. He is particularly known for his work on ancient manuscripts and his contributions to the study of ecclesiastical history.
In the 18th century, the name Casaubon continued to be associated with intellectual pursuits. Jacques Casaubon (1679-1759) was a French mathematician and astronomer who made significant contributions to the field of celestial mechanics. He is best known for his work on planetary orbits and the development of mathematical models to predict their movements.
Moving into the 19th century, the Casaubon name gained literary recognition with the character of Edward Casaubon in George Eliot's novel "Middlemarch" (1871-1872). Although a fictional character, Edward Casaubon was portrayed as an erudite scholar engaged in the pursuit of knowledge, reflecting the scholarly associations of the name.
Throughout its history, the surname Casaubon has been closely tied to intellectual and academic endeavors, with numerous individuals bearing this name making notable contributions to various fields of study, including literature, classical studies, theology, mathematics, and astronomy.
Demographics
Ancestry and ethnicity for Casaubon
Among Census respondents with the surname Casaubon, the largest self-reported group is White at 63.0%. The next largest groups are Hispanic (27.8%) and Two or More Races (5.6%).
The bar chart below shows how Casaubon 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 Casaubon surname at the time of the 2020 Census, not any inherent property of the name itself.
- White63.0% · 68
- Hispanic or Latino27.8% · 30
- Two or more races5.6% · 6
- Asian and Pacific Islander2.8% · 3
- Black or African American0.9% · 1
Timeline
Historical Census data for Casaubon
Casaubon appears in 2 published Census surname files: 2010, 2020. The cards below show how the name's rank and bearer count changed across each release.
2020
#150,935
National surname rank
Recorded bearers 108
+3 bearers (+2.9%)
Per 100,000 0.04
Rank movement Up 3,972 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2010 | #154,907 | 105 | 0.04 | First available Census row | First available Census row |
| 2020 | #150,935 | 108 | 0.04 | +3 bearers (+2.9%) | Up 3,972 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 Casaubon 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 | #154,907 | #150,935 | 2.6% |
| Count | 105 | 108 | 2.9% |
| Per 100K | 0.04 | 0.04 | -9.7% |
Between the 2010 and 2020 Census, the number of Casaubon bearers went from 105 to 108 (+2.9% change). The surname moved up 3,972 positions in the national ranking, going from #154,907 to #150,935.
FAQ
Casaubon surname: questions and answers
How many people in the U.S. have the surname Casaubon?
Name Census estimates that about 124 living Americans carry the surname Casaubon. Using the current population baseline, that works out to roughly 1 in 2,764,148 residents.
How common is Casaubon?
Casaubon ranks #150,935 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 108 people with the surname Casaubon. That is different from the site's living-bearer estimate (124), 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 Casaubon.
Has Casaubon become more or less common over time?
Between 2010 and 2020, the surname Casaubon went from 105 recorded bearers to 108. That is an increase of 3 (+2.9%). In the national ranking it rose from #154,907 to #150,935.
What does the Census say about the background of Casaubon?
Among Census respondents with the surname Casaubon, the largest self-reported group is White at 63.0%. The next largest groups are Hispanic (27.8%) and Two or More Races (5.6%). 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 Casaubon in the 2020 Census, accounting for 63.0% (68 people in the source table).
What is the full ancestry breakdown?
Casaubon appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (63.0%), Hispanic (27.8%), Two or More Races (5.6%). 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 Casaubon (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 Casaubon mean?
A French surname potentially referring to an inhabitant of a small or new house. 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 Casaubon (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 many Americans have the surname Casaubon?
For a faster, more casual read, check HowManyOfMe.org — our sister site built around that single question.