2010
#154,907
National surname rank
Recorded bearers 105
First available Census row
Per 100,000 0.04
Very Rare Last name
Sainio
A surname of Finnish origin meaning someone from a remote locale or small village.
According to the 2020 US Census Bureau surname tables, roughly 118 Americans carry the last name Sainio. That puts it at #154,182 in the national surname ranking, appearing at a frequency of 0.03 per 100,000 people (about 1 in 2,904,698 residents).
This page is the full Name Census profile for the Sainio 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
118
1 in 2,904,698
Census rank
#154,182
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
103
very rare in the US
Popularity narrative
The Census Bureau recorded 103 bearers of the surname Sainio in its 2020 decennial surname file. At a rate of 0.03 per 100,000 residents, it holds the 154182nd position in the national surname ranking.
Among Census respondents with the surname Sainio, the largest self-reported group is White at 91.3%. The next largest groups are Hispanic (3.9%) and Two or More Races (2.9%).
Origin
Meaning and origin of Sainio
The surname Sainio is of Finnish origin, tracing its roots back to the 16th century. It is derived from the Finnish word "sainio," which means a threshing barn or a granary. The name was likely adopted by individuals who lived near or worked in such structures, often indicating their occupation or place of residence.
The earliest recorded instances of the name Sainio can be found in parish records and tax registers from the regions of Uusimaa and Häme in southern Finland. These records date back to the late 16th and early 17th centuries, indicating the name's longstanding presence in the area.
One of the earliest documented individuals with the surname Sainio was Matts Sainio, born in 1635 in the village of Hausjärvi, located in the province of Uusimaa. He was a farmer and landowner, a common occupation among those bearing the Sainio name during that era.
In the 18th century, records show a Sainio family residing in the town of Kangasala, near Tampere in the province of Häme. Antti Sainio, born in 1721, was a prominent figure in the local community, serving as a church warden and a respected landowner.
During the 19th century, the Sainio name gained recognition with the birth of Juho Kustaanpoika Sainio (1839-1919), a Finnish author and journalist who played a significant role in the development of Finnish literature and journalism. His works, including novels and short stories, reflected the rural life and traditions of his time.
Another notable individual with the surname Sainio was Arvi Sainio (1905-1986), a Finnish architect renowned for his modernist designs. He was responsible for several iconic buildings in Helsinki, including the Kallio Church and the Sainio Residential Area, which bears his name.
In more recent times, the name Sainio has been carried by individuals such as Pekka Sainio (born 1938), a Finnish diplomat who served as the Ambassador of Finland to the United States from 1990 to 1995, and Mika Sainio (born 1976), a Finnish professional ice hockey player who played in the National Hockey League for several teams.
The surname Sainio remains prevalent in Finland, particularly in the southern regions where it originated. Its historical significance lies in its connection to the agricultural heritage of the country and its association with prominent figures in various fields, from literature and journalism to architecture and sports.
Demographics
Ancestry and ethnicity for Sainio
Among Census respondents with the surname Sainio, the largest self-reported group is White at 91.3%. The next largest groups are Hispanic (3.9%) and Two or More Races (2.9%).
The bar chart below shows how Sainio 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 Sainio surname at the time of the 2020 Census, not any inherent property of the name itself.
- White91.3% · 94
- Hispanic or Latino3.9% · 4
- Two or more races2.9% · 3
- Black or African American1.0% · 1
- Asian and Pacific Islander1.0% · 1
Timeline
Historical Census data for Sainio
Sainio 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
#154,182
National surname rank
Recorded bearers 103
-2 bearers (-1.9%)
Per 100,000 0.03
Rank movement Up 725 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 | #154,182 | 103 | 0.03 | -2 bearers (-1.9%) | Up 725 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 Sainio 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 | #154,182 | 0.5% |
| Count | 105 | 103 | -1.9% |
| Per 100K | 0.04 | 0.03 | -13.9% |
Between the 2010 and 2020 Census, the number of Sainio bearers went from 105 to 103 (-1.9% change). The surname moved up 725 positions in the national ranking, going from #154,907 to #154,182.
FAQ
Sainio surname: questions and answers
How many people in the U.S. have the surname Sainio?
Name Census estimates that about 118 living Americans carry the surname Sainio. Using the current population baseline, that works out to roughly 1 in 2,904,698 residents.
How common is Sainio?
Sainio ranks #154,182 in the 2020 Census surname tables and is classified on this site as "Very Rare." The Census recorded the name at a frequency of 0.03 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 103 people with the surname Sainio. That is different from the site's living-bearer estimate (118), which projects the surname's present-day count by applying the Census frequency rate to the current U.S. population.
What does 0.03 per 100,000 actually mean?
It is the Census Bureau's normalized frequency measure. A rate of 0.03 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 Sainio.
Has Sainio become more or less common over time?
Between 2010 and 2020, the surname Sainio went from 105 recorded bearers to 103. That is a decrease of 2 (-1.9%). In the national ranking it rose from #154,907 to #154,182.
What does the Census say about the background of Sainio?
Among Census respondents with the surname Sainio, the largest self-reported group is White at 91.3%. The next largest groups are Hispanic (3.9%) and Two or More Races (2.9%). 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 Sainio in the 2020 Census, accounting for 91.3% (94 people in the source table).
What is the full ancestry breakdown?
Sainio appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (91.3%), Hispanic (3.9%), Two or More Races (2.9%). 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 Sainio (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 Sainio mean?
A surname of Finnish origin meaning someone from a remote locale or small village. 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 Sainio (0.03 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 have the last name Sainio?
Our sister site HowManyOfMe.org answers how many people have the last name Sainio at a glance, with the living-bearer count up front.