2000
#134,037
National surname rank
Recorded bearers 116
First available Census row
Per 100,000 0.04
Very Rare Last name
Jaensch
A surname of German origin referring to someone from a place called Jehnitz.
According to the 2020 US Census Bureau surname tables, roughly 123 Americans carry the last name Jaensch. That puts it at #151,639 in the national surname ranking, appearing at a frequency of 0.04 per 100,000 people (about 1 in 2,786,621 residents).
This page is the full Name Census profile for the Jaensch 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
123
1 in 2,786,621
Census rank
#151,639
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
107
very rare in the US
Popularity narrative
The Census Bureau recorded 107 bearers of the surname Jaensch in its 2020 decennial surname file. At a rate of 0.04 per 100,000 residents, it holds the 151639th position in the national surname ranking.
Among Census respondents with the surname Jaensch, the largest self-reported group is White at 87.9%. The next largest groups are Two or More Races (5.6%) and Hispanic (2.8%).
Origin
Meaning and origin of Jaensch
The surname Jaensch is believed to have originated in Germany, with records dating back to the 16th century. It is thought to be derived from the Old German word "Jänsch," which referred to a resident of the area known as Jänschau or Jänschendorf. These place names were likely derived from a personal name, possibly a diminutive form of Johannes.
One of the earliest known references to the Jaensch surname can be found in the church records of the town of Löbau, located in the German state of Saxony. In 1586, a record mentions a certain Hans Jaensch, who was a resident of the town. It is believed that this individual may have been one of the first to bear the surname in its modern spelling.
During the 17th and 18th centuries, the name Jaensch became more widespread throughout various regions of Germany, particularly in the states of Saxony, Brandenburg, and Silesia. Notable individuals bearing this surname during this period include Johann Gottfried Jaensch (1702-1780), a German theologian and author, and Carl Friedrich Jaensch (1763-1827), a German lawyer and philosopher.
As the 19th century dawned, the Jaensch surname continued to spread across Germany and into neighboring countries. One notable figure from this era was Gustav Jaensch (1833-1916), a German architect and urban planner who was involved in the design of several prominent buildings in Berlin.
In the early 20th century, the Jaensch surname found its way to other parts of the world, including the United States and Australia. Ernst Jaensch (1883-1940), a German psychologist and philosopher, made significant contributions to the field of characterology, while Gerhard Jaensch (1888-1962), a German naval officer, played a role in the development of submarine warfare during World War I.
Throughout history, the Jaensch surname has been associated with various occupations and fields, from academia and theology to architecture and military service. While its origins can be traced back to specific regions of Germany, the name has since spread to various corners of the globe, carried by individuals who have left their mark on the world in diverse ways.
Demographics
Ancestry and ethnicity for Jaensch
Among Census respondents with the surname Jaensch, the largest self-reported group is White at 87.9%. The next largest groups are Two or More Races (5.6%) and Hispanic (2.8%).
The bar chart below shows how Jaensch 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 Jaensch surname at the time of the 2020 Census, not any inherent property of the name itself.
- White87.9% · 94
- Two or more races5.6% · 6
- Hispanic or Latino2.8% · 3
- Black or African American1.9% · 2
- Asian and Pacific Islander0.9% · 1
- American Indian and Alaska Native0.9% · 1
Timeline
Historical Census data for Jaensch
Jaensch 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
#151,532
National surname rank
Recorded bearers 108
-8 bearers (-6.9%)
Per 100,000 0.04
Rank movement Down 17,495 places
2020
#151,639
National surname rank
Recorded bearers 107
-1 bearers (-0.9%)
Per 100,000 0.04
Rank movement Down 107 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #134,037 | 116 | 0.04 | First available Census row | First available Census row |
| 2010 | #151,532 | 108 | 0.04 | -8 bearers (-6.9%) | Down 17,495 places |
| 2020 | #151,639 | 107 | 0.04 | -1 bearers (-0.9%) | Down 107 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 Jaensch 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 | #151,532 | #151,639 | -0.1% |
| Count | 108 | 107 | -0.9% |
| Per 100K | 0.04 | 0.04 | -10.5% |
Between the 2010 and 2020 Census, the number of Jaensch bearers went from 108 to 107 (-0.9% change). The surname moved down 107 positions in the national ranking, going from #151,532 to #151,639.
FAQ
Jaensch surname: questions and answers
How many people in the U.S. have the surname Jaensch?
Name Census estimates that about 123 living Americans carry the surname Jaensch. Using the current population baseline, that works out to roughly 1 in 2,786,621 residents.
How common is Jaensch?
Jaensch ranks #151,639 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 107 people with the surname Jaensch. That is different from the site's living-bearer estimate (123), 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 Jaensch.
Has Jaensch become more or less common over time?
Between 2010 and 2020, the surname Jaensch went from 108 recorded bearers to 107. That is a decrease of 1 (-0.9%). In the national ranking it fell from #151,532 to #151,639.
What does the Census say about the background of Jaensch?
Among Census respondents with the surname Jaensch, the largest self-reported group is White at 87.9%. The next largest groups are Two or More Races (5.6%) and Hispanic (2.8%). 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 Jaensch in the 2020 Census, accounting for 87.9% (94 people in the source table).
What is the full ancestry breakdown?
Jaensch appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (87.9%), Two or More Races (5.6%), Hispanic (2.8%). 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 Jaensch (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 Jaensch mean?
A surname of German origin referring to someone from a place called Jehnitz. 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 Jaensch (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 share the surname Jaensch?
HowManyOfMe.org, our sister site, answers that with the living-bearer count in one glance.