2000
#142,819
National surname rank
Recorded bearers 107
First available Census row
Per 100,000 0.04
Very Rare Last name
Mrock
An Americanized spelling of a German or Jewish surname derived from occupational roots.
According to the 2020 US Census Bureau surname tables, roughly 114 Americans carry the last name Mrock. That puts it at #156,005 in the national surname ranking, appearing at a frequency of 0.03 per 100,000 people (about 1 in 3,006,617 residents).
This page is the full Name Census profile for the Mrock 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
114
1 in 3,006,617
Census rank
#156,005
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
99
very rare in the US
Popularity narrative
The Census Bureau recorded 99 bearers of the surname Mrock in its 2020 decennial surname file. At a rate of 0.03 per 100,000 residents, it holds the 156005th position in the national surname ranking.
Among Census respondents with the surname Mrock, the largest self-reported group is White at 94.9%. The next largest groups are Hispanic (5.1%).
Origin
Meaning and origin of Mrock
The surname MROCK originates from the region of Saxony in Germany, with its roots dating back to the 12th century. It is believed to have derived from the Old German word "mrock," which referred to a type of woolen cloak or mantle worn by peasants and commoners during that era.
One of the earliest recorded instances of the MROCK surname can be found in the Bederollen, an ancient German census record from the year 1295. This document contains an entry for a certain "Heinrich Mrock," who was a farmer residing in the village of Gernrode, located in the Harz mountain range.
The MROCK name also appears in several medieval manuscripts and chronicles, including the Codex Diplomaticus Saxoniae, a collection of historical documents from the region of Saxony. In this compilation, there is a reference to a "Johannes Mrock," who served as a blacksmith in the town of Meissen during the late 14th century.
As the surname spread across various regions of Germany, it underwent slight variations in spelling, such as "Mrok," "Mroeck," and "Mrogg." These variations often reflected the local dialects and linguistic influences of the areas where the name was adopted.
One notable figure bearing the MROCK surname was Hans Mrock, a renowned painter and woodcarver who lived in the city of Nuremberg during the 16th century (1512-1578). His intricate religious sculptures and altarpieces adorned several churches throughout Bavaria and Franconia.
Another prominent individual was Johann Mrock (1681-1743), a German theologian and philosopher who served as a professor at the University of Leipzig. His published works, which explored the intersection of religion and metaphysics, were widely influential during the Age of Enlightenment.
In the 19th century, the MROCK name gained recognition through the accomplishments of Wilhelmine Mrock (1825-1901), a German author and activist who championed women's rights and educational reform. Her autobiographical novel, "Aus meinem Leben" (From My Life), provided insights into the societal challenges faced by women during that era.
Other notable individuals with the MROCK surname include Karl Mrock (1887-1965), a German military officer who served in both World Wars, and Erich Mrock (1910-1986), a renowned archaeologist who made significant contributions to the study of ancient Roman settlements in modern-day Germany.
While the MROCK surname may have evolved over time and spread across different regions, its origins can be traced back to the humble peasantry of medieval Saxony, where it was associated with a simple article of clothing worn by commoners during that era.
Demographics
Ancestry and ethnicity for Mrock
Among Census respondents with the surname Mrock, the largest self-reported group is White at 94.9%. The next largest groups are Hispanic (5.1%).
The bar chart below shows how Mrock 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 Mrock surname at the time of the 2020 Census, not any inherent property of the name itself.
- White94.9% · 94
- Hispanic or Latino5.1% · 5
Timeline
Historical Census data for Mrock
Mrock 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
+10 bearers (+9.3%)
Per 100,000 0.04
Rank movement Up 711 places
2020
#156,005
National surname rank
Recorded bearers 99
-18 bearers (-15.4%)
Per 100,000 0.03
Rank movement Down 13,897 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #142,819 | 107 | 0.04 | First available Census row | First available Census row |
| 2010 | #142,108 | 117 | 0.04 | +10 bearers (+9.3%) | Up 711 places |
| 2020 | #156,005 | 99 | 0.03 | -18 bearers (-15.4%) | Down 13,897 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 Mrock 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 | #156,005 | -9.8% |
| Count | 117 | 99 | -15.4% |
| Per 100K | 0.04 | 0.03 | -17.2% |
Between the 2010 and 2020 Census, the number of Mrock bearers went from 117 to 99 (-15.4% change). The surname moved down 13,897 positions in the national ranking, going from #142,108 to #156,005.
FAQ
Mrock surname: questions and answers
How many people in the U.S. have the surname Mrock?
Name Census estimates that about 114 living Americans carry the surname Mrock. Using the current population baseline, that works out to roughly 1 in 3,006,617 residents.
How common is Mrock?
Mrock ranks #156,005 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 99 people with the surname Mrock. That is different from the site's living-bearer estimate (114), 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 Mrock.
Has Mrock become more or less common over time?
Between 2010 and 2020, the surname Mrock went from 117 recorded bearers to 99. That is a decrease of 18 (-15.4%). In the national ranking it fell from #142,108 to #156,005.
What does the Census say about the background of Mrock?
Among Census respondents with the surname Mrock, the largest self-reported group is White at 94.9%. The next largest groups are Hispanic (5.1%). 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 Mrock in the 2020 Census, accounting for 94.9% (94 people in the source table).
What is the full ancestry breakdown?
Mrock appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (94.9%), Hispanic (5.1%). 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 Mrock (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 Mrock mean?
An Americanized spelling of a German or Jewish surname derived from occupational roots. 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 Mrock (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 surname Mrock?
For a faster, more casual read, check HowManyOfMe.org — our sister site built around that single question.