2000
#8,028
National surname rank
Recorded bearers 3,811
First available Census row
Per 100,000 1.41
Rare Last name
Sirois
A French surname derived from the Old French term "sire," meaning "lord" or "master."
According to the 2020 US Census Bureau surname tables, roughly 4,197 Americans carry the last name Sirois. That puts it at #8,612 in the national surname ranking, appearing at a frequency of 1.22 per 100,000 people (about 1 in 81,667 residents).
This page is the full Name Census profile for the Sirois 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
4.2K
1 in 81,667
Census rank
#8,612
2020 decennial data
Per 100,000
1.2
Frequency rate
Recorded bearers
3.7K
rare in the US
Popularity narrative
The Census Bureau recorded 3,660 bearers of the surname Sirois in its 2020 decennial surname file. At a rate of 1.22 per 100,000 residents, it holds the 8612th position in the national surname ranking.
Among Census respondents with the surname Sirois, the largest self-reported group is White at 93.0%. The next largest groups are Two or More Races (3.0%) and Hispanic (1.8%).
Origin
Meaning and origin of Sirois
The surname SIROIS has its origins in France, with the earliest records dating back to the 16th century. The name is believed to have derived from the Old French word "sirop," which meant "syrup" or "molasses." This suggests that the name may have been originally associated with someone involved in the production or trade of these sweet substances.
One of the earliest recorded instances of the SIROIS name can be found in a French census record from 1594, which mentions a family by the name of Siroys living in the Normandy region. The spelling variations during that time included Sirois, Siroys, and Siroyes.
In the 17th century, the SIROIS name began to appear in various documents and records across different regions of France. For example, a baptismal record from 1612 in the parish of Saint-Étienne in Paris mentions a child named Jean SIROIS. Another notable record from 1678 refers to a merchant named Pierre SIROIS who was involved in the trade of sugar and molasses in the port city of La Rochelle.
As the centuries progressed, the SIROIS name spread to other parts of Europe and eventually to the Americas. One notable figure was François SIROIS, a French-Canadian born in 1765 in Quebec, who served as a soldier during the American Revolutionary War.
In the 19th century, a prominent SIROIS was Émilie SIROIS, a French educator and writer born in 1835. She was known for her contributions to the field of education and for her efforts in promoting women's rights.
Another notable individual was Jean-Baptiste SIROIS, a French-Canadian politician and lawyer born in 1869 in Quebec. He served as a member of the Canadian House of Commons and played a significant role in the political landscape of his time.
The SIROIS name has also been associated with various places and geographical locations. For example, there is a small town called Sirois in the department of Pas-de-Calais in northern France, which likely derived its name from the surname itself.
Throughout history, the SIROIS surname has been represented across various fields, including politics, education, military, and commerce, reflecting the diverse backgrounds and contributions of those who have carried this name.
Demographics
Ancestry and ethnicity for Sirois
Among Census respondents with the surname Sirois, the largest self-reported group is White at 93.0%. The next largest groups are Two or More Races (3.0%) and Hispanic (1.8%).
The bar chart below shows how Sirois 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 Sirois surname at the time of the 2020 Census, not any inherent property of the name itself.
- White93.0% · 3,402
- Two or more races3.0% · 108
- Hispanic or Latino1.8% · 66
- Asian and Pacific Islander1.1% · 40
- American Indian and Alaska Native0.7% · 24
- Black or African American0.5% · 20
Timeline
Historical Census data for Sirois
Sirois 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
#8,483
National surname rank
Recorded bearers 3,887
+76 bearers (+2.0%)
Per 100,000 1.32
Rank movement Down 455 places
2020
#8,612
National surname rank
Recorded bearers 3,660
-227 bearers (-5.8%)
Per 100,000 1.22
Rank movement Down 129 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #8,028 | 3,811 | 1.41 | First available Census row | First available Census row |
| 2010 | #8,483 | 3,887 | 1.32 | +76 bearers (+2.0%) | Down 455 places |
| 2020 | #8,612 | 3,660 | 1.22 | -227 bearers (-5.8%) | Down 129 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 Sirois 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 | #8,483 | #8,612 | -1.5% |
| Count | 3,887 | 3,660 | -5.8% |
| Per 100K | 1.32 | 1.22 | -7.2% |
Between the 2010 and 2020 Census, the number of Sirois bearers went from 3,887 to 3,660 (-5.8% change). The surname moved down 129 positions in the national ranking, going from #8,483 to #8,612.
FAQ
Sirois surname: questions and answers
How many people in the U.S. have the surname Sirois?
Name Census estimates that about 4,197 living Americans carry the surname Sirois. Using the current population baseline, that works out to roughly 1 in 81,667 residents.
How common is Sirois?
Sirois ranks #8,612 in the 2020 Census surname tables and is classified on this site as "Rare." The Census recorded the name at a frequency of 1.22 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 3,660 people with the surname Sirois. That is different from the site's living-bearer estimate (4,197), which projects the surname's present-day count by applying the Census frequency rate to the current U.S. population.
What does 1.22 per 100,000 actually mean?
It is the Census Bureau's normalized frequency measure. A rate of 1.22 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 Sirois.
Has Sirois become more or less common over time?
Between 2010 and 2020, the surname Sirois went from 3,887 recorded bearers to 3,660. That is a decrease of 227 (-5.8%). In the national ranking it fell from #8,483 to #8,612.
What does the Census say about the background of Sirois?
Among Census respondents with the surname Sirois, the largest self-reported group is White at 93.0%. The next largest groups are Two or More Races (3.0%) and Hispanic (1.8%). 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 Sirois in the 2020 Census, accounting for 93.0% (3,402 people in the source table).
What is the full ancestry breakdown?
Sirois appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (93.0%), Two or More Races (3.0%), Hispanic (1.8%). 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 Sirois (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 Sirois mean?
A French surname derived from the Old French term "sire," meaning "lord" or "master." 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 Sirois (1.22 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 Sirois?
See how many people have the surname Sirois on HowManyOfMe.org, our sister site built around that single question.