2000
#73,412
National surname rank
Recorded bearers 246
First available Census row
Per 100,000 0.09
Very Rare Last name
Rosar
A possible toponymic surname derived from a place name containing the element "ros" meaning a fell or moor.
According to the 2020 US Census Bureau surname tables, roughly 234 Americans carry the last name Rosar. That puts it at #95,802 in the national surname ranking, appearing at a frequency of 0.07 per 100,000 people (about 1 in 1,464,762 residents).
This page is the full Name Census profile for the Rosar 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
234
1 in 1,464,762
Census rank
#95,802
2020 decennial data
Per 100,000
0.1
Frequency rate
Recorded bearers
204
very rare in the US
Popularity narrative
The Census Bureau recorded 204 bearers of the surname Rosar in its 2020 decennial surname file. At a rate of 0.07 per 100,000 residents, it holds the 95802nd position in the national surname ranking.
Among Census respondents with the surname Rosar, the largest self-reported group is White at 88.2%. The next largest groups are Hispanic (7.8%) and Two or More Races (2.5%).
Origin
Meaning and origin of Rosar
The surname Rosar is believed to have originated in the Veneto region of northeastern Italy during the medieval period. It is derived from the Italian word "rosa," meaning "rose," and was likely an occupational name given to those who cultivated or sold roses.
One of the earliest recorded instances of the name Rosar can be found in a document from the city of Verona, dated 1289, which mentions a certain "Petrus Rosar." This suggests that the name was already established in the area by the late 13th century.
In the 14th century, the name appeared in various records from the Venetian Republic, such as the "Libro d'Oro" (Book of Gold), which listed noble families of the region. One notable individual from this period was Giovanni Rosar (c. 1320-1389), a wealthy merchant and landowner from the city of Vicenza.
The Rosar name also had variants and localized spellings, such as "Rosario" and "Rosari," which were more common in southern Italy and Sicily. In the 15th century, a Sicilian family bearing the name Rosari gained prominence, with members serving as military officers and advisors to the ruling dynasties.
As the Renaissance period dawned, the name Rosar spread beyond Italy, carried by merchants and travelers. In the 16th century, a Spanish explorer named Juan Rosar (c. 1510-1583) accompanied Hernán Cortés on his expeditions to the New World and is believed to have settled in Mexico.
In the 17th century, the Rosar name appeared in various European countries, including France, where a notable figure was the poet and playwright Pierre Rosar (1637-1707), whose works were acclaimed during the reign of Louis XIV.
Other notable individuals bearing the Rosar surname include:
1. Antonio Rosar (1759-1832), an Italian painter and sculptor from Venice
2. Émilie Rosar (1825-1892), a French novelist and women's rights advocate
3. Josef Rosar (1892-1976), an Austrian architect and urban planner
4. Margarita Rosar (1920-2004), a Chilean political activist and human rights defender
5. Giancarlo Rosar (born 1954), an Italian author and journalist known for his works on history and culture.
Demographics
Ancestry and ethnicity for Rosar
Among Census respondents with the surname Rosar, the largest self-reported group is White at 88.2%. The next largest groups are Hispanic (7.8%) and Two or More Races (2.5%).
The bar chart below shows how Rosar 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 Rosar surname at the time of the 2020 Census, not any inherent property of the name itself.
- White88.2% · 180
- Hispanic or Latino7.8% · 16
- Two or more races2.5% · 5
- Black or African American1.0% · 2
- Asian and Pacific Islander0.5% · 1
Timeline
Historical Census data for Rosar
Rosar 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
#88,685
National surname rank
Recorded bearers 209
-37 bearers (-15.0%)
Per 100,000 0.07
Rank movement Down 15,273 places
2020
#95,802
National surname rank
Recorded bearers 204
-5 bearers (-2.4%)
Per 100,000 0.07
Rank movement Down 7,117 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #73,412 | 246 | 0.09 | First available Census row | First available Census row |
| 2010 | #88,685 | 209 | 0.07 | -37 bearers (-15.0%) | Down 15,273 places |
| 2020 | #95,802 | 204 | 0.07 | -5 bearers (-2.4%) | Down 7,117 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 Rosar 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 | #88,685 | #95,802 | -8.0% |
| Count | 209 | 204 | -2.4% |
| Per 100K | 0.07 | 0.07 | -2.5% |
Between the 2010 and 2020 Census, the number of Rosar bearers went from 209 to 204 (-2.4% change). The surname moved down 7,117 positions in the national ranking, going from #88,685 to #95,802.
Notable bearers
Famous people with the surname Rosar
FAQ
Rosar surname: questions and answers
How many people in the U.S. have the surname Rosar?
Name Census estimates that about 234 living Americans carry the surname Rosar. Using the current population baseline, that works out to roughly 1 in 1,464,762 residents.
How common is Rosar?
Rosar ranks #95,802 in the 2020 Census surname tables and is classified on this site as "Very Rare." The Census recorded the name at a frequency of 0.07 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 204 people with the surname Rosar. That is different from the site's living-bearer estimate (234), which projects the surname's present-day count by applying the Census frequency rate to the current U.S. population.
What does 0.07 per 100,000 actually mean?
It is the Census Bureau's normalized frequency measure. A rate of 0.07 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 Rosar.
Has Rosar become more or less common over time?
Between 2010 and 2020, the surname Rosar went from 209 recorded bearers to 204. That is a decrease of 5 (-2.4%). In the national ranking it fell from #88,685 to #95,802.
What does the Census say about the background of Rosar?
Among Census respondents with the surname Rosar, the largest self-reported group is White at 88.2%. The next largest groups are Hispanic (7.8%) and Two or More Races (2.5%). 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 Rosar in the 2020 Census, accounting for 88.2% (180 people in the source table).
What is the full ancestry breakdown?
Rosar appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (88.2%), Hispanic (7.8%), Two or More Races (2.5%). 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 Rosar (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 Rosar mean?
A possible toponymic surname derived from a place name containing the element "ros" meaning a fell or moor. 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 Rosar (0.07 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 are called Rosar?
Find out how many people have the surname Rosar on our sister site HowManyOfMe.org — a quick modern estimate with the living-bearer count front and centre.