2000
#134,929
National surname rank
Recorded bearers 115
First available Census row
Per 100,000 0.04
Very Rare Last name
Rosewarne
A surname originating from a location name in Cornwall, England.
According to the 2020 US Census Bureau surname tables, roughly 120 Americans carry the last name Rosewarne. That puts it at #152,989 in the national surname ranking, appearing at a frequency of 0.04 per 100,000 people (about 1 in 2,856,286 residents).
This page is the full Name Census profile for the Rosewarne 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 Rosewarne with 1881 census detail, origin facts and modern UK distribution where available.
Bearers in the US
120
1 in 2,856,286
Census rank
#152,989
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
105
very rare in the US
Popularity narrative
The Census Bureau recorded 105 bearers of the surname Rosewarne in its 2020 decennial surname file. At a rate of 0.04 per 100,000 residents, it holds the 152989th position in the national surname ranking.
Among Census respondents with the surname Rosewarne, the largest self-reported group is White at 92.4%. The next largest groups are Hispanic (5.7%) and Asian/Pacific Islander (1.0%).
Origin
Meaning and origin of Rosewarne
The surname Rosewarne is believed to have originated in Cornwall, a county in the southwestern peninsula of England. It is a locational name, derived from the Cornish place name Ros Waran, meaning "valley of the alder trees." This suggests that the name originated among families residing in an area characterized by alder trees growing in a valley.
The earliest known recorded instance of the name dates back to the late 16th century. One of the earliest documented references is found in the parish records of St. Just in Penwith, Cornwall, where a Thomas Rosewarne was mentioned in 1592. The name also appears in the Protestation Returns of 1641-42, a historical record documenting individuals who took an oath of allegiance to the Protestant religion.
During the 17th century, the name Rosewarne was primarily concentrated in the western regions of Cornwall, particularly in the parishes of St. Buryan, St. Just in Penwith, and Sancreed. Records from this period include variations in spelling, such as Rosewarn, Rosewarren, and Rosewarryn, reflecting the fluidity of surname spellings in earlier times.
One notable individual bearing the Rosewarne name was John Rosewarne (1696-1755), a wealthy merchant and landowner from St. Buryan, Cornwall. He was instrumental in establishing the county's first Methodist society, and his home served as a meeting place for early Methodist groups.
Another prominent figure was Thomas Rosewarne (1781-1857), a Cornish antiquarian and historian. He authored several works on Cornish history and antiquities, including "The Ancient Cornish Drama" and "The Customs and Manners of the Ancient Cornish." His contributions helped preserve and document Cornwall's rich cultural heritage.
In the late 18th century, Samuel Rosewarne (1757-1838), a Cornish mathematician and surveyor, gained recognition for his work on the construction of the Falmouth to Truro turnpike road. His expertise in surveying and engineering played a crucial role in the development of Cornwall's transportation infrastructure.
The Rosewarne surname also has connections to the mining industry, which was a significant part of Cornwall's economic history. John Rosewarne (1842-1920), born in Redruth, Cornwall, was a prominent mine agent and engineer who oversaw various mines in the region.
Lastly, Reverend John Gwyn Rosewarne (1834-1903), a Cornish clergyman and author, made notable contributions to the study of Cornish language and literature. His work "The Cornish Drama" is considered a valuable resource for understanding the literary traditions of Cornwall.
While the surname Rosewarne has its roots firmly planted in Cornwall, over time, families with this name have dispersed to other parts of England and beyond, carrying with them the rich history and heritage associated with their Cornish origins.
Demographics
Ancestry and ethnicity for Rosewarne
Among Census respondents with the surname Rosewarne, the largest self-reported group is White at 92.4%. The next largest groups are Hispanic (5.7%) and Asian/Pacific Islander (1.0%).
The bar chart below shows how Rosewarne 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 Rosewarne surname at the time of the 2020 Census, not any inherent property of the name itself.
- White92.4% · 97
- Hispanic or Latino5.7% · 6
- Asian and Pacific Islander1.0% · 1
- American Indian and Alaska Native1.0% · 1
Timeline
Historical Census data for Rosewarne
Rosewarne 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
#144,141
National surname rank
Recorded bearers 115
+0 bearers (+0.0%)
Per 100,000 0.04
Rank movement Down 9,212 places
2020
#152,989
National surname rank
Recorded bearers 105
-10 bearers (-8.7%)
Per 100,000 0.04
Rank movement Down 8,848 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #134,929 | 115 | 0.04 | First available Census row | First available Census row |
| 2010 | #144,141 | 115 | 0.04 | +0 bearers (+0.0%) | Down 9,212 places |
| 2020 | #152,989 | 105 | 0.04 | -10 bearers (-8.7%) | Down 8,848 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 Rosewarne 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 | #144,141 | #152,989 | -6.1% |
| Count | 115 | 105 | -8.7% |
| Per 100K | 0.04 | 0.04 | -12.2% |
Between the 2010 and 2020 Census, the number of Rosewarne bearers went from 115 to 105 (-8.7% change). The surname moved down 8,848 positions in the national ranking, going from #144,141 to #152,989.
FAQ
Rosewarne surname: questions and answers
How many people in the U.S. have the surname Rosewarne?
Name Census estimates that about 120 living Americans carry the surname Rosewarne. Using the current population baseline, that works out to roughly 1 in 2,856,286 residents.
How common is Rosewarne?
Rosewarne ranks #152,989 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 105 people with the surname Rosewarne. That is different from the site's living-bearer estimate (120), 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 Rosewarne.
Has Rosewarne become more or less common over time?
Between 2010 and 2020, the surname Rosewarne went from 115 recorded bearers to 105. That is a decrease of 10 (-8.7%). In the national ranking it fell from #144,141 to #152,989.
What does the Census say about the background of Rosewarne?
Among Census respondents with the surname Rosewarne, the largest self-reported group is White at 92.4%. The next largest groups are Hispanic (5.7%) and Asian/Pacific Islander (1.0%). 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 Rosewarne in the 2020 Census, accounting for 92.4% (97 people in the source table).
What is the full ancestry breakdown?
Rosewarne appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (92.4%), Hispanic (5.7%), Asian/Pacific Islander (1.0%). 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 Rosewarne (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 Rosewarne mean?
A surname originating from a location name in Cornwall, England. 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 Rosewarne (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 Americans have the surname Rosewarne?
For a quick modern estimate, our sister site HowManyOfMe.org answers that in one glance, with the living-bearer count front and centre.