2000
#144,908
National surname rank
Recorded bearers 105
First available Census row
Per 100,000 0.04
Very Rare Last name
Senno
A surname derived from the Spanish word "seño" meaning wise or sensible.
According to the 2020 US Census Bureau surname tables, roughly 127 Americans carry the last name Senno. That puts it at #148,665 in the national surname ranking, appearing at a frequency of 0.04 per 100,000 people (about 1 in 2,698,853 residents).
This page is the full Name Census profile for the Senno 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
127
1 in 2,698,853
Census rank
#148,665
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
111
very rare in the US
Popularity narrative
The Census Bureau recorded 111 bearers of the surname Senno in its 2020 decennial surname file. At a rate of 0.04 per 100,000 residents, it holds the 148665th position in the national surname ranking.
Among Census respondents with the surname Senno, the largest self-reported group is White at 89.2%. The next largest groups are Two or More Races (4.5%) and Hispanic (2.7%).
Origin
Meaning and origin of Senno
The surname SENNO has its origins in Italy, specifically in the region of Tuscany. It can be traced back to the late medieval period, around the 13th or 14th century. The name is believed to be derived from the Italian word "senno," which means "wisdom" or "good sense." This suggests that the name may have originally been a nickname given to someone who was considered wise or prudent.
One of the earliest recorded instances of the SENNO name can be found in the town of Siena, where a family of that name was documented in historical records dating back to the 15th century. The name was also present in other Tuscan cities, such as Florence and Pisa, during the Renaissance period.
A notable figure bearing the SENNO surname was Tommaso Senno, a renowned scholar and philosopher who lived in Florence during the 16th century (c. 1520-1590). He was known for his treatises on logic and ethics, and his works were widely studied in academic circles of the time.
Another individual of historical significance was Giovanni Battista Senno (1588-1663), a military engineer and architect from Siena. He was commissioned by the Medici family to design and construct several fortifications and defensive structures in the region.
In the 18th century, Pietro Senno (1720-1789) was a prominent painter from the city of Pisa. His works, primarily depicting religious scenes and portraits, can be found in various churches and galleries throughout Tuscany.
During the Italian unification movement of the 19th century, a politician named Carlo Senno (1815-1888) from Florence played an active role in the struggle for independence and the formation of the Kingdom of Italy.
The SENNO name also appears in historical records from other parts of Italy, such as the regions of Lazio and Campania, although it is considered to have originated in Tuscany. Some variations in spelling, such as "Sennio" or "Sennini," can also be found in certain areas.
Demographics
Ancestry and ethnicity for Senno
Among Census respondents with the surname Senno, the largest self-reported group is White at 89.2%. The next largest groups are Two or More Races (4.5%) and Hispanic (2.7%).
The bar chart below shows how Senno 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 Senno surname at the time of the 2020 Census, not any inherent property of the name itself.
- White89.2% · 99
- Two or more races4.5% · 5
- Hispanic or Latino2.7% · 3
- Asian and Pacific Islander2.7% · 3
- Black or African American0.9% · 1
Timeline
Historical Census data for Senno
Senno 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
#142,108
National surname rank
Recorded bearers 117
+12 bearers (+11.4%)
Per 100,000 0.04
Rank movement Up 2,800 places
2020
#148,665
National surname rank
Recorded bearers 111
-6 bearers (-5.1%)
Per 100,000 0.04
Rank movement Down 6,557 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #144,908 | 105 | 0.04 | First available Census row | First available Census row |
| 2010 | #142,108 | 117 | 0.04 | +12 bearers (+11.4%) | Up 2,800 places |
| 2020 | #148,665 | 111 | 0.04 | -6 bearers (-5.1%) | Down 6,557 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 Senno 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 | #142,108 | #148,665 | -4.6% |
| Count | 117 | 111 | -5.1% |
| Per 100K | 0.04 | 0.04 | -7.2% |
Between the 2010 and 2020 Census, the number of Senno bearers went from 117 to 111 (-5.1% change). The surname moved down 6,557 positions in the national ranking, going from #142,108 to #148,665.
FAQ
Senno surname: questions and answers
How many people in the U.S. have the surname Senno?
Name Census estimates that about 127 living Americans carry the surname Senno. Using the current population baseline, that works out to roughly 1 in 2,698,853 residents.
How common is Senno?
Senno ranks #148,665 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 111 people with the surname Senno. That is different from the site's living-bearer estimate (127), 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 Senno.
Has Senno become more or less common over time?
Between 2010 and 2020, the surname Senno went from 117 recorded bearers to 111. That is a decrease of 6 (-5.1%). In the national ranking it fell from #142,108 to #148,665.
What does the Census say about the background of Senno?
Among Census respondents with the surname Senno, the largest self-reported group is White at 89.2%. The next largest groups are Two or More Races (4.5%) and Hispanic (2.7%). 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 Senno in the 2020 Census, accounting for 89.2% (99 people in the source table).
What is the full ancestry breakdown?
Senno appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (89.2%), Two or More Races (4.5%), Hispanic (2.7%). 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 Senno (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 Senno mean?
A surname derived from the Spanish word "seño" meaning wise or sensible. 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 Senno (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 people are called Senno?
You can see how common the surname Senno is on our sister site HowManyOfMe.org — same data roots, lighter UI.