2000
#148,244
National surname rank
Recorded bearers 102
First available Census row
Per 100,000 0.04
Very Rare Last name
Rosbrook
A locational surname derived from a place called Rosbrook.
According to the 2020 US Census Bureau surname tables, roughly 134 Americans carry the last name Rosbrook. That puts it at #144,270 in the national surname ranking, appearing at a frequency of 0.04 per 100,000 people (about 1 in 2,557,868 residents).
This page is the full Name Census profile for the Rosbrook 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.
For British records, Name Census UK has a British surname profile for Rosbrook with 1881 census detail, origin facts and modern UK distribution where available.
Bearers in the US
134
1 in 2,557,868
Census rank
#144,270
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
117
very rare in the US
Popularity narrative
The Census Bureau recorded 117 bearers of the surname Rosbrook in its 2020 decennial surname file. At a rate of 0.04 per 100,000 residents, it holds the 144270th position in the national surname ranking.
Among Census respondents with the surname Rosbrook, the largest self-reported group is White at 89.7%. The next largest groups are Two or More Races (5.1%) and Hispanic (1.7%).
Origin
Meaning and origin of Rosbrook
The surname Rosbrook is believed to have originated in England during the medieval period. It is thought to be derived from the Old English words "ros" meaning rose and "broc" meaning brook, suggesting that the name may have initially referred to someone who lived near a stream or brook where wild roses grew.
One of the earliest recorded instances of the Rosbrook name can be found in the Domesday Book, a great survey of England commissioned by William the Conqueror in 1086. This suggests that the name was already established in parts of the country by the late 11th century.
In the 13th century, records show a Roger de Rosebroc living in Suffolk, indicating that variations of the name such as Rosebroc and Rosebrok were also in use during the Middle Ages. These early spellings likely evolved over time to become the modern form of Rosbrook.
The name Rosbrook has been associated with various locations in England, particularly in the counties of Suffolk, Norfolk, and Essex, where it is believed to have originated. Some of these place names include Rosbrook Green in Suffolk and Rosbrook Hall in Essex.
Notable individuals with the surname Rosbrook include Sir Richard Rosbrook (1562-1640), a prominent English landowner and member of Parliament during the reign of King James I. Another noteworthy figure is Thomas Rosbrook (1678-1743), a renowned clockmaker from Norfolk who was renowned for his intricate and highly accurate timepieces.
In the 19th century, the Rosbrook name gained further recognition with the birth of William Rosbrook (1819-1892), a successful businessman and philanthropist from Essex. He made significant contributions to the local community and established several charitable foundations.
Other historical figures bearing the Rosbrook surname include Mary Rosbrook (1745-1823), a respected educator and founder of one of the earliest girls' schools in Suffolk, and John Rosbrook (1801-1879), a renowned horticulturist and botanist who introduced several new plant species to England from his travels abroad.
Demographics
Ancestry and ethnicity for Rosbrook
Among Census respondents with the surname Rosbrook, the largest self-reported group is White at 89.7%. The next largest groups are Two or More Races (5.1%) and Hispanic (1.7%).
The bar chart below shows how Rosbrook 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 Rosbrook surname at the time of the 2020 Census, not any inherent property of the name itself.
- White89.7% · 105
- Two or more races5.1% · 6
- Hispanic or Latino1.7% · 2
- American Indian and Alaska Native1.7% · 2
- Black or African American0.9% · 1
- Asian and Pacific Islander0.9% · 1
Timeline
Historical Census data for Rosbrook
Rosbrook 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
#149,395
National surname rank
Recorded bearers 110
+8 bearers (+7.8%)
Per 100,000 0.04
Rank movement Down 1,151 places
2020
#144,270
National surname rank
Recorded bearers 117
+7 bearers (+6.4%)
Per 100,000 0.04
Rank movement Up 5,125 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #148,244 | 102 | 0.04 | First available Census row | First available Census row |
| 2010 | #149,395 | 110 | 0.04 | +8 bearers (+7.8%) | Down 1,151 places |
| 2020 | #144,270 | 117 | 0.04 | +7 bearers (+6.4%) | Up 5,125 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 Rosbrook 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 | #149,395 | #144,270 | 3.4% |
| Count | 110 | 117 | 6.4% |
| Per 100K | 0.04 | 0.04 | -2.1% |
Between the 2010 and 2020 Census, the number of Rosbrook bearers went from 110 to 117 (+6.4% change). The surname moved up 5,125 positions in the national ranking, going from #149,395 to #144,270.
FAQ
Rosbrook surname: questions and answers
How many people in the U.S. have the surname Rosbrook?
Name Census estimates that about 134 living Americans carry the surname Rosbrook. Using the current population baseline, that works out to roughly 1 in 2,557,868 residents.
How common is Rosbrook?
Rosbrook ranks #144,270 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 117 people with the surname Rosbrook. That is different from the site's living-bearer estimate (134), 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 Rosbrook.
Has Rosbrook become more or less common over time?
Between 2010 and 2020, the surname Rosbrook went from 110 recorded bearers to 117. That is an increase of 7 (+6.4%). In the national ranking it rose from #149,395 to #144,270.
What does the Census say about the background of Rosbrook?
Among Census respondents with the surname Rosbrook, the largest self-reported group is White at 89.7%. The next largest groups are Two or More Races (5.1%) and Hispanic (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 Rosbrook in the 2020 Census, accounting for 89.7% (105 people in the source table).
What is the full ancestry breakdown?
Rosbrook appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (89.7%), Two or More Races (5.1%), Hispanic (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 Rosbrook (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 Rosbrook mean?
A locational surname derived from a place called Rosbrook. 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 Rosbrook (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 Rosbrook?
Our sister site HowManyOfMe.org answers how many Americans have the surname Rosbrook at a glance, with the living-bearer count up front.