2000
#19,328
National surname rank
Recorded bearers 1,297
First available Census row
Per 100,000 0.48
Rare Last name
Deblois
A French locational surname derived from the French town of DeBlois.
According to the 2020 US Census Bureau surname tables, roughly 1,463 Americans carry the last name Deblois. That puts it at #20,949 in the national surname ranking, appearing at a frequency of 0.43 per 100,000 people (about 1 in 234,282 residents).
This page is the full Name Census profile for the Deblois 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
1.5K
1 in 234,282
Census rank
#20,949
2020 decennial data
Per 100,000
0.4
Frequency rate
Recorded bearers
1.3K
rare in the US
Popularity narrative
The Census Bureau recorded 1,276 bearers of the surname Deblois in its 2020 decennial surname file. At a rate of 0.43 per 100,000 residents, it holds the 20949th position in the national surname ranking.
Among Census respondents with the surname Deblois, the largest self-reported group is White at 92.2%. The next largest groups are Two or More Races (3.1%) and Asian/Pacific Islander (2.3%).
Origin
Meaning and origin of Deblois
The surname DEBLOIS is of French origin, deriving from the Old French words "de blois" which translate to "from Blois". Blois is a city in the Loire Valley region of central France, dating back to the 9th century. The surname likely originated as a way to identify individuals who hailed from this area.
The earliest known record of the DEBLOIS name appears in the 12th century Cartulary of Notre-Dame de Chartres, a collection of charters and deeds from the cathedral in Chartres, France. In this document, a person named Gervaise de Blois is mentioned, indicating the use of the locational surname.
During the Middle Ages, the DEBLOIS surname was particularly prevalent in the regions surrounding Blois, such as Orléanais and Touraine. It is also found in various medieval records and documents from this time period, including the Livre des Bourgeois de Blois, a register of citizens from the city of Blois.
One notable historical figure with the DEBLOIS surname was Jean de Blois (c. 1275-1335), a French nobleman and military commander who fought in the Hundred Years' War. He participated in several battles against the English and was held captive for a period of time.
Another prominent individual was Étienne de Blois (c. 1096-1154), a French prelate who served as the Archbishop of Canterbury in England from 1123 to 1128. He played a significant role in the conflicts between King Henry I of England and the Church.
In the 17th century, a branch of the DEBLOIS family emigrated from France to Canada, establishing themselves in the colony of New France. One of the earliest recorded DEBLOIS in Canada was Jacques de Blois (1655-1718), who settled in Quebec City and worked as a merchant and landowner.
Guillaume de Blois (1618-1693) was a French Jesuit missionary who spent several years in what is now known as the Great Lakes region of North America, working among various Native American tribes.
As the surname spread across Europe and North America, various spelling variations emerged, such as DeBlois, De Blois, and Deblois. The name also became associated with certain place names, such as the village of Deblois in Maine, United States, which was likely named after an early settler with the DEBLOIS surname.
Demographics
Ancestry and ethnicity for Deblois
Among Census respondents with the surname Deblois, the largest self-reported group is White at 92.2%. The next largest groups are Two or More Races (3.1%) and Asian/Pacific Islander (2.3%).
The bar chart below shows how Deblois 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 Deblois surname at the time of the 2020 Census, not any inherent property of the name itself.
- White92.2% · 1,176
- Two or more races3.1% · 39
- Asian and Pacific Islander2.3% · 29
- Hispanic or Latino2.1% · 27
- Black or African American0.4% · 5
Timeline
Historical Census data for Deblois
Deblois 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
#20,076
National surname rank
Recorded bearers 1,331
+34 bearers (+2.6%)
Per 100,000 0.45
Rank movement Down 748 places
2020
#20,949
National surname rank
Recorded bearers 1,276
-55 bearers (-4.1%)
Per 100,000 0.43
Rank movement Down 873 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #19,328 | 1,297 | 0.48 | First available Census row | First available Census row |
| 2010 | #20,076 | 1,331 | 0.45 | +34 bearers (+2.6%) | Down 748 places |
| 2020 | #20,949 | 1,276 | 0.43 | -55 bearers (-4.1%) | Down 873 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 Deblois 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 | #20,076 | #20,949 | -4.3% |
| Count | 1,331 | 1,276 | -4.1% |
| Per 100K | 0.45 | 0.43 | -5.1% |
Between the 2010 and 2020 Census, the number of Deblois bearers went from 1,331 to 1,276 (-4.1% change). The surname moved down 873 positions in the national ranking, going from #20,076 to #20,949.
Notable bearers
Famous people with the surname Deblois
FAQ
Deblois surname: questions and answers
How many people in the U.S. have the surname Deblois?
Name Census estimates that about 1,463 living Americans carry the surname Deblois. Using the current population baseline, that works out to roughly 1 in 234,282 residents.
How common is Deblois?
Deblois ranks #20,949 in the 2020 Census surname tables and is classified on this site as "Rare." The Census recorded the name at a frequency of 0.43 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 1,276 people with the surname Deblois. That is different from the site's living-bearer estimate (1,463), which projects the surname's present-day count by applying the Census frequency rate to the current U.S. population.
What does 0.43 per 100,000 actually mean?
It is the Census Bureau's normalized frequency measure. A rate of 0.43 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 Deblois.
Has Deblois become more or less common over time?
Between 2010 and 2020, the surname Deblois went from 1,331 recorded bearers to 1,276. That is a decrease of 55 (-4.1%). In the national ranking it fell from #20,076 to #20,949.
What does the Census say about the background of Deblois?
Among Census respondents with the surname Deblois, the largest self-reported group is White at 92.2%. The next largest groups are Two or More Races (3.1%) and Asian/Pacific Islander (2.3%). 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 Deblois in the 2020 Census, accounting for 92.2% (1,176 people in the source table).
What is the full ancestry breakdown?
Deblois appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (92.2%), Two or More Races (3.1%), Asian/Pacific Islander (2.3%). 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 Deblois (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 Deblois mean?
A French locational surname derived from the French town of DeBlois. 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 Deblois (0.43 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 share the surname Deblois?
For a quick modern estimate, our sister site HowManyOfMe.org answers that in one glance, with the living-bearer count front and centre.