2010
#159,712
National surname rank
Recorded bearers 101
First available Census row
Per 100,000 0.03
Very Rare Last name
Rosga
A surname of possible Slavic or Polish origin, with an undetermined meaning.
According to the 2020 US Census Bureau surname tables, roughly 124 Americans carry the last name Rosga. That puts it at #150,935 in the national surname ranking, appearing at a frequency of 0.04 per 100,000 people (about 1 in 2,764,148 residents).
This page is the full Name Census profile for the Rosga 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
124
1 in 2,764,148
Census rank
#150,935
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
108
very rare in the US
Popularity narrative
The Census Bureau recorded 108 bearers of the surname Rosga in its 2020 decennial surname file. At a rate of 0.04 per 100,000 residents, it holds the 150935th position in the national surname ranking.
Among Census respondents with the surname Rosga, the largest self-reported group is White at 93.5%. The next largest groups are Two or More Races (3.7%) and American Indian/Alaska Native (1.9%).
Origin
Meaning and origin of Rosga
The surname ROSGA has its origins in the northern regions of Spain, specifically the Basque Country and Navarre. It emerged during the early medieval period, likely between the 8th and 10th centuries. The name is believed to be derived from the Basque word "roga," which means "reddish-brown" or "auburn," suggesting a connection to physical features or hair color.
One of the earliest recorded instances of the surname ROSGA can be found in the Becerro Galicano, a medieval census and tax record from the 13th century. This document mentions individuals with the surname ROSGA residing in the villages of Salinas de Oro and Leiza, both located in Navarre.
In the 14th century, a notable figure named Juan ROSGA was mentioned in the Cartulario de Santa María de Nájera, a compilation of documents from the Monastery of Santa María la Real in Nájera, La Rioja. This cartulary records Juan ROSGA as a landowner and benefactor of the monastery.
During the 15th century, the surname ROSGA spread beyond the northern regions of Spain, with records indicating individuals bearing this name residing in Andalusia and Castile. One such individual was Alonso ROSGA, a merchant from Seville who was born around 1450 and is mentioned in the archives of the Casa de Contratación, which oversaw trade with the Spanish colonies in the Americas.
In the 16th century, a prominent figure named Isabel ROSGA (1520-1589) was a renowned healer and midwife in the town of Tudela, Navarre. Her skills were widely recognized, and she was often sought after by noble families in the region.
Another notable individual with the surname ROSGA was Pedro ROSGA (1632-1701), a military commander who fought in the War of the Spanish Succession. He was born in Pamplona and rose through the ranks, eventually becoming a captain in the Spanish army.
Over the centuries, the surname ROSGA has been found in various parts of Spain, with variations in spelling such as ROSGA, ROZGA, and RUZGA. While the name remains most prevalent in the Basque Country and Navarre, it has also been carried by individuals across the Iberian Peninsula and beyond.
Demographics
Ancestry and ethnicity for Rosga
Among Census respondents with the surname Rosga, the largest self-reported group is White at 93.5%. The next largest groups are Two or More Races (3.7%) and American Indian/Alaska Native (1.9%).
The bar chart below shows how Rosga 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 Rosga surname at the time of the 2020 Census, not any inherent property of the name itself.
- White93.5% · 101
- Two or more races3.7% · 4
- American Indian and Alaska Native1.9% · 2
- Hispanic or Latino0.9% · 1
Timeline
Historical Census data for Rosga
Rosga appears in 2 published Census surname files: 2010, 2020. The cards below show how the name's rank and bearer count changed across each release.
2020
#150,935
National surname rank
Recorded bearers 108
+7 bearers (+6.9%)
Per 100,000 0.04
Rank movement Up 8,777 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2010 | #159,712 | 101 | 0.03 | First available Census row | First available Census row |
| 2020 | #150,935 | 108 | 0.04 | +7 bearers (+6.9%) | Up 8,777 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 Rosga 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 | #159,712 | #150,935 | 5.5% |
| Count | 101 | 108 | 6.9% |
| Per 100K | 0.03 | 0.04 | 20.4% |
Between the 2010 and 2020 Census, the number of Rosga bearers went from 101 to 108 (+6.9% change). The surname moved up 8,777 positions in the national ranking, going from #159,712 to #150,935.
FAQ
Rosga surname: questions and answers
How many people in the U.S. have the surname Rosga?
Name Census estimates that about 124 living Americans carry the surname Rosga. Using the current population baseline, that works out to roughly 1 in 2,764,148 residents.
How common is Rosga?
Rosga ranks #150,935 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 108 people with the surname Rosga. That is different from the site's living-bearer estimate (124), 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 Rosga.
Has Rosga become more or less common over time?
Between 2010 and 2020, the surname Rosga went from 101 recorded bearers to 108. That is an increase of 7 (+6.9%). In the national ranking it rose from #159,712 to #150,935.
What does the Census say about the background of Rosga?
Among Census respondents with the surname Rosga, the largest self-reported group is White at 93.5%. The next largest groups are Two or More Races (3.7%) and American Indian/Alaska Native (1.9%). 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 Rosga in the 2020 Census, accounting for 93.5% (101 people in the source table).
What is the full ancestry breakdown?
Rosga appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (93.5%), Two or More Races (3.7%), American Indian/Alaska Native (1.9%). 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 Rosga (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 Rosga mean?
A surname of possible Slavic or Polish origin, with an undetermined meaning. 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 Rosga (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 Rosga?
HowManyOfMe.org, our sister site, answers that with the living-bearer count in one glance.