2010
#146,201
National surname rank
Recorded bearers 113
First available Census row
Per 100,000 0.04
Very Rare Last name
Olnhausen
A German toponymic surname derived from a placename containing the component "hauen", meaning forest clearing or cultivated land.
According to the 2020 US Census Bureau surname tables, roughly 132 Americans carry the last name Olnhausen. That puts it at #145,757 in the national surname ranking, appearing at a frequency of 0.04 per 100,000 people (about 1 in 2,596,624 residents).
This page is the full Name Census profile for the Olnhausen 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
132
1 in 2,596,624
Census rank
#145,757
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
115
very rare in the US
Popularity narrative
The Census Bureau recorded 115 bearers of the surname Olnhausen in its 2020 decennial surname file. At a rate of 0.04 per 100,000 residents, it holds the 145757th position in the national surname ranking.
Among Census respondents with the surname Olnhausen, the largest self-reported group is White at 94.8%. The next largest groups are Hispanic (2.6%) and Two or More Races (1.7%).
Origin
Meaning and origin of Olnhausen
The surname Olnhausen is believed to have originated in Germany during the medieval period. It is derived from the Old German words "olden" and "hausen," meaning "old" and "house" or "dwelling," respectively. This suggests that the name initially referred to someone who lived in an old or established settlement.
One of the earliest recorded instances of the name Olnhausen can be found in the Codex Diplomaticus Anhaltinus, a collection of historical documents from the Anhalt region of Germany, dating back to the 13th century. The name is also mentioned in several other medieval manuscripts and records from various German principalities and duchies.
In the 15th century, a notable individual named Johann Olnhausen (1420-1481) was a prominent scholar and theologian at the University of Heidelberg. He is known for his contributions to the study of canon law and his involvement in the Council of Basel.
During the 16th century, the Olnhausen surname can be traced to the town of Olnhausen, located in the present-day state of Hesse, Germany. This town likely originated as a settlement with an old or established dwelling, which may have contributed to the name's origin.
In the 17th century, Hans Olnhausen (1601-1663) was a German painter and engraver who specialized in religious and allegorical works. His paintings and engravings can be found in various churches and collections throughout Germany and neighboring countries.
Another notable figure was Friedrich Olnhausen (1771-1841), a German jurist and legal scholar who served as a judge and professor of law at the University of Göttingen. He made significant contributions to the development of German civil law and legal theory.
In the 19th century, Hermann Olnhausen (1822-1908) was a German-American businessman and philanthropist who founded the Olnhausen Billiard Company in New York City. The company became renowned for manufacturing high-quality billiard tables and accessories, and it continues to operate today.
While the surname Olnhausen has its roots in Germany, it has since spread to other parts of the world, including North America and other European countries, through immigration and migration patterns over the centuries.
Demographics
Ancestry and ethnicity for Olnhausen
Among Census respondents with the surname Olnhausen, the largest self-reported group is White at 94.8%. The next largest groups are Hispanic (2.6%) and Two or More Races (1.7%).
The bar chart below shows how Olnhausen 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 Olnhausen surname at the time of the 2020 Census, not any inherent property of the name itself.
- White94.8% · 109
- Hispanic or Latino2.6% · 3
- Two or more races1.7% · 2
- Black or African American0.9% · 1
Timeline
Historical Census data for Olnhausen
Olnhausen 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
#145,757
National surname rank
Recorded bearers 115
+2 bearers (+1.8%)
Per 100,000 0.04
Rank movement Up 444 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2010 | #146,201 | 113 | 0.04 | First available Census row | First available Census row |
| 2020 | #145,757 | 115 | 0.04 | +2 bearers (+1.8%) | Up 444 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 Olnhausen 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 | #146,201 | #145,757 | 0.3% |
| Count | 113 | 115 | 1.8% |
| Per 100K | 0.04 | 0.04 | -3.8% |
Between the 2010 and 2020 Census, the number of Olnhausen bearers went from 113 to 115 (+1.8% change). The surname moved up 444 positions in the national ranking, going from #146,201 to #145,757.
FAQ
Olnhausen surname: questions and answers
How many people in the U.S. have the surname Olnhausen?
Name Census estimates that about 132 living Americans carry the surname Olnhausen. Using the current population baseline, that works out to roughly 1 in 2,596,624 residents.
How common is Olnhausen?
Olnhausen ranks #145,757 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 115 people with the surname Olnhausen. That is different from the site's living-bearer estimate (132), 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 Olnhausen.
Has Olnhausen become more or less common over time?
Between 2010 and 2020, the surname Olnhausen went from 113 recorded bearers to 115. That is an increase of 2 (+1.8%). In the national ranking it rose from #146,201 to #145,757.
What does the Census say about the background of Olnhausen?
Among Census respondents with the surname Olnhausen, the largest self-reported group is White at 94.8%. The next largest groups are Hispanic (2.6%) and Two or More Races (1.7%). 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 Olnhausen in the 2020 Census, accounting for 94.8% (109 people in the source table).
What is the full ancestry breakdown?
Olnhausen appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (94.8%), Hispanic (2.6%), Two or More Races (1.7%). 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 Olnhausen (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 Olnhausen mean?
A German toponymic surname derived from a placename containing the component "hauen", meaning forest clearing or cultivated land. 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 Olnhausen (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 have the last name Olnhausen?
Our sister site HowManyOfMe.org answers how common the surname Olnhausen is at a glance, with the living-bearer count up front.