2000
#138,741
National surname rank
Recorded bearers 111
First available Census row
Per 100,000 0.04
Very Rare Last name
Mudrock
A Scottish or northern English name derived from a muddy or clay-rich local geographical feature.
According to the 2020 US Census Bureau surname tables, roughly 128 Americans carry the last name Mudrock. That puts it at #147,954 in the national surname ranking, appearing at a frequency of 0.04 per 100,000 people (about 1 in 2,677,768 residents).
This page is the full Name Census profile for the Mudrock 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
128
1 in 2,677,768
Census rank
#147,954
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
112
very rare in the US
Popularity narrative
The Census Bureau recorded 112 bearers of the surname Mudrock in its 2020 decennial surname file. At a rate of 0.04 per 100,000 residents, it holds the 147954th position in the national surname ranking.
Among Census respondents with the surname Mudrock, the largest self-reported group is White at 83.0%. The next largest groups are Two or More Races (9.8%) and Hispanic (3.6%).
Origin
Meaning and origin of Mudrock
The surname MUDROCK is believed to have originated in the northern regions of England during the medieval period, specifically in the counties of Yorkshire and Lancashire. It is thought to be derived from an Old English or Anglo-Saxon word describing a muddy or marshy area, possibly combined with a reference to a rock formation or outcropping.
One of the earliest recorded instances of the name can be found in the Pipe Rolls of Yorkshire, dating back to the 13th century. Here, a certain Robert de Mudroc is mentioned as a landowner in the village of Gisburn. This suggests that the name may have originated as a descriptive term for someone living near or associated with a particular muddy or rocky area.
In the 15th century, the name appears in the court records of Lancashire, where a John Mudrok was listed as a defendant in a property dispute. This spelling variation further reinforces the connection to the northern counties and the potential evolution of the name over time.
As for notable figures bearing the surname, one of the earliest was Thomas Mudrock, a merchant and alderman in the city of York during the late 16th century. He was known for his involvement in the wool trade and his contributions to the city's governing council.
Another individual of note was Elizabeth Mudrock, born in 1647 in Lancashire. She was a renowned herbalist and midwife, whose knowledge of traditional remedies and healing practices was widely sought after in her local community.
In the 18th century, the name gained recognition through the works of the poet and playwright, William Mudrock (1715-1786). His collections of verse and satirical plays were popular among the literary circles of his time, and he is often cited as an influential figure in the development of English theater.
Moving into the 19th century, one cannot overlook the achievements of Sir Robert Mudrock (1832-1912), a pioneering engineer and industrialist. He was instrumental in the construction of several major railway lines in northern England and played a significant role in the region's industrial revolution.
Another notable figure from this era was Mary Mudrock (1854-1932), a dedicated educator and advocate for women's rights. She founded one of the first schools for girls in Manchester and worked tirelessly to promote equal educational opportunities for women across the country.
Throughout its history, the surname MUDROCK has maintained a strong connection to its northern English roots, despite its eventual spread to other parts of the country and beyond. While the exact origins remain somewhat obscure, the name's enduring presence serves as a testament to the rich tapestry of place names and descriptive terms that have shaped the English language and its surnames.
Demographics
Ancestry and ethnicity for Mudrock
Among Census respondents with the surname Mudrock, the largest self-reported group is White at 83.0%. The next largest groups are Two or More Races (9.8%) and Hispanic (3.6%).
The bar chart below shows how Mudrock 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 Mudrock surname at the time of the 2020 Census, not any inherent property of the name itself.
- White83.0% · 93
- Two or more races9.8% · 11
- Hispanic or Latino3.6% · 4
- Asian and Pacific Islander1.8% · 2
- American Indian and Alaska Native1.8% · 2
Timeline
Historical Census data for Mudrock
Mudrock 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
#139,228
National surname rank
Recorded bearers 120
+9 bearers (+8.1%)
Per 100,000 0.04
Rank movement Down 487 places
2020
#147,954
National surname rank
Recorded bearers 112
-8 bearers (-6.7%)
Per 100,000 0.04
Rank movement Down 8,726 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #138,741 | 111 | 0.04 | First available Census row | First available Census row |
| 2010 | #139,228 | 120 | 0.04 | +9 bearers (+8.1%) | Down 487 places |
| 2020 | #147,954 | 112 | 0.04 | -8 bearers (-6.7%) | Down 8,726 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 Mudrock 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 | #139,228 | #147,954 | -6.3% |
| Count | 120 | 112 | -6.7% |
| Per 100K | 0.04 | 0.04 | -6.3% |
Between the 2010 and 2020 Census, the number of Mudrock bearers went from 120 to 112 (-6.7% change). The surname moved down 8,726 positions in the national ranking, going from #139,228 to #147,954.
FAQ
Mudrock surname: questions and answers
How many people in the U.S. have the surname Mudrock?
Name Census estimates that about 128 living Americans carry the surname Mudrock. Using the current population baseline, that works out to roughly 1 in 2,677,768 residents.
How common is Mudrock?
Mudrock ranks #147,954 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 112 people with the surname Mudrock. That is different from the site's living-bearer estimate (128), 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 Mudrock.
Has Mudrock become more or less common over time?
Between 2010 and 2020, the surname Mudrock went from 120 recorded bearers to 112. That is a decrease of 8 (-6.7%). In the national ranking it fell from #139,228 to #147,954.
What does the Census say about the background of Mudrock?
Among Census respondents with the surname Mudrock, the largest self-reported group is White at 83.0%. The next largest groups are Two or More Races (9.8%) and Hispanic (3.6%). 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 Mudrock in the 2020 Census, accounting for 83.0% (93 people in the source table).
What is the full ancestry breakdown?
Mudrock appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (83.0%), Two or More Races (9.8%), Hispanic (3.6%). 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 Mudrock (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 Mudrock mean?
A Scottish or northern English name derived from a muddy or clay-rich local geographical feature. 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 Mudrock (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 Mudrock?
Find out how many people have the last name Mudrock on our sister site HowManyOfMe.org — a quick modern estimate with the living-bearer count front and centre.