2000
#125,639
National surname rank
Recorded bearers 126
First available Census row
Per 100,000 0.05
Very Rare Last name
Blaurock
A surname meaning "blue rock" or "blue cliff" in German.
According to the 2020 US Census Bureau surname tables, roughly 127 Americans carry the last name Blaurock. 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 Blaurock 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 Blaurock 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 Blaurock, the largest self-reported group is White at 91.0%. The next largest groups are Black (3.6%) and Hispanic (2.7%).
Origin
Meaning and origin of Blaurock
The surname Blaurock is of German origin, with its roots dating back to the 16th century in the region of Germany known as the Palatinate. The name is derived from the German words "blau" meaning blue, and "rock" which can refer to a coat or garment, suggesting that the name may have originally referred to someone who wore a blue coat or robe.
The earliest recorded instance of the Blaurock surname appears in a 16th-century manuscript from the city of Alzey, located in the Palatinate region. This document mentions a certain "Hans Blaurock," believed to have been a prominent figure in the Anabaptist movement during the Protestant Reformation.
One of the most notable historical figures with the Blaurock surname was Georg Blaurock (c. 1492-1529), a renowned Anabaptist leader and one of the first adherents of the Swiss Brethren movement. He was actively involved in the early spread of Anabaptist teachings throughout Switzerland and Germany, and was eventually martyred for his beliefs in 1529.
Another significant figure was Matthias Blaurock (c. 1498-1565), a close associate of Georg Blaurock and a prominent figure in the Anabaptist movement. He played a crucial role in the establishment of Anabaptist communities in various regions of Germany and the Netherlands.
In the 17th century, the Blaurock name appeared in records from the town of Baumholder, located in the Rhineland-Palatinate region of Germany. One notable individual from this period was Johann Blaurock (1625-1701), a respected scholar and theologian who authored several influential works on religious philosophy.
The Blaurock surname also has a historical connection to the town of Blaurock (now known as Blauring) in the Alsace region of France. This town likely derived its name from the same linguistic roots as the surname, suggesting that the name may have originated in this area before spreading to other parts of Germany and beyond.
During the 18th and 19th centuries, the Blaurock surname continued to appear in various records and documents across Germany, with individuals bearing this name contributing to various fields, including academia, literature, and the arts.
Demographics
Ancestry and ethnicity for Blaurock
Among Census respondents with the surname Blaurock, the largest self-reported group is White at 91.0%. The next largest groups are Black (3.6%) and Hispanic (2.7%).
The bar chart below shows how Blaurock 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 Blaurock surname at the time of the 2020 Census, not any inherent property of the name itself.
- White91.0% · 101
- Black or African American3.6% · 4
- Hispanic or Latino2.7% · 3
- Two or more races1.8% · 2
- Asian and Pacific Islander0.9% · 1
Timeline
Historical Census data for Blaurock
Blaurock 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
#131,379
National surname rank
Recorded bearers 129
+3 bearers (+2.4%)
Per 100,000 0.04
Rank movement Down 5,740 places
2020
#148,665
National surname rank
Recorded bearers 111
-18 bearers (-14.0%)
Per 100,000 0.04
Rank movement Down 17,286 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #125,639 | 126 | 0.05 | First available Census row | First available Census row |
| 2010 | #131,379 | 129 | 0.04 | +3 bearers (+2.4%) | Down 5,740 places |
| 2020 | #148,665 | 111 | 0.04 | -18 bearers (-14.0%) | Down 17,286 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 Blaurock 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 | #131,379 | #148,665 | -13.2% |
| Count | 129 | 111 | -14.0% |
| Per 100K | 0.04 | 0.04 | -7.2% |
Between the 2010 and 2020 Census, the number of Blaurock bearers went from 129 to 111 (-14.0% change). The surname moved down 17,286 positions in the national ranking, going from #131,379 to #148,665.
FAQ
Blaurock surname: questions and answers
How many people in the U.S. have the surname Blaurock?
Name Census estimates that about 127 living Americans carry the surname Blaurock. Using the current population baseline, that works out to roughly 1 in 2,698,853 residents.
How common is Blaurock?
Blaurock 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 Blaurock. 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 Blaurock.
Has Blaurock become more or less common over time?
Between 2010 and 2020, the surname Blaurock went from 129 recorded bearers to 111. That is a decrease of 18 (-14.0%). In the national ranking it fell from #131,379 to #148,665.
What does the Census say about the background of Blaurock?
Among Census respondents with the surname Blaurock, the largest self-reported group is White at 91.0%. The next largest groups are Black (3.6%) 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 Blaurock in the 2020 Census, accounting for 91.0% (101 people in the source table).
What is the full ancestry breakdown?
Blaurock appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (91.0%), Black (3.6%), 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 Blaurock (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 Blaurock mean?
A surname meaning "blue rock" or "blue cliff" in German. 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 Blaurock (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 common is the surname Blaurock?
Find out how many Americans have the surname Blaurock on our sister site HowManyOfMe.org — a quick modern estimate with the living-bearer count front and centre.