2000
#116,835
National surname rank
Recorded bearers 138
First available Census row
Per 100,000 0.05
Very Rare Last name
Niewiarowski
A Polish surname indicating the bearer's Jewish ancestry.
According to the 2020 US Census Bureau surname tables, roughly 125 Americans carry the last name Niewiarowski. That puts it at #150,205 in the national surname ranking, appearing at a frequency of 0.04 per 100,000 people (about 1 in 2,742,035 residents).
This page is the full Name Census profile for the Niewiarowski 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
125
1 in 2,742,035
Census rank
#150,205
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
109
very rare in the US
Popularity narrative
The Census Bureau recorded 109 bearers of the surname Niewiarowski in its 2020 decennial surname file. At a rate of 0.04 per 100,000 residents, it holds the 150205th position in the national surname ranking.
Among Census respondents with the surname Niewiarowski, the largest self-reported group is White at 93.6%. The next largest groups are Hispanic (6.4%).
Origin
Meaning and origin of Niewiarowski
The surname "NIEWIAROWSKI" originates from Poland, with its roots stretching back to the 15th century. It is derived from the Polish word "niewiarowski," which means "unbelieving" or "disbelieving." This suggests that the name may have been given to someone who was skeptical or had a reputation for doubting claims.
The earliest known record of the name dates back to 1492, when a nobleman named Jan Niewiarowski was mentioned in a manuscript detailing the council proceedings in the city of Krakow. This document is now housed in the Jagiellonian Library, one of the oldest libraries in Poland.
In the 16th century, the name appeared in various records from the region of Greater Poland, particularly in the towns of Poznan and Gniezno. One notable individual from this era was Marianna Niewiarowski, a landowner and philanthropist who lived from 1534 to 1612. She was known for her contributions to the development of local schools and churches.
The 17th century saw the emergence of Franciszek Niewiarowski, a renowned scholar and philosopher born in 1623. He studied at the University of Krakow and later became a professor of metaphysics at the same institution. His writings on epistemology and the nature of knowledge were influential during his time.
In the late 18th century, the name was associated with a prominent military figure, General Kazimierz Niewiarowski (1745-1819). He served in the Polish-Lithuanian Commonwealth army and played a crucial role in several battles against the Russian Empire during the partitions of Poland.
Another notable individual bearing the Niewiarowski surname was Zofia Niewiarowski (1879-1967), a pioneering female architect who made significant contributions to the design and construction of several landmarks in Warsaw. Her work was recognized for its blend of traditional Polish architectural elements with modern aesthetics.
The name "NIEWIAROWSKI" has been carried through generations, with its bearers leaving their mark in various fields, from academia and the military to the arts and architecture. While its origins stem from a skeptical connotation, the surname has evolved to represent a rich cultural heritage deeply rooted in Polish history.
Demographics
Ancestry and ethnicity for Niewiarowski
Among Census respondents with the surname Niewiarowski, the largest self-reported group is White at 93.6%. The next largest groups are Hispanic (6.4%).
The bar chart below shows how Niewiarowski 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 Niewiarowski surname at the time of the 2020 Census, not any inherent property of the name itself.
- White93.6% · 102
- Hispanic or Latino6.4% · 7
Timeline
Historical Census data for Niewiarowski
Niewiarowski 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
#131,379
National surname rank
Recorded bearers 129
-9 bearers (-6.5%)
Per 100,000 0.04
Rank movement Down 14,544 places
2020
#150,205
National surname rank
Recorded bearers 109
-20 bearers (-15.5%)
Per 100,000 0.04
Rank movement Down 18,826 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #116,835 | 138 | 0.05 | First available Census row | First available Census row |
| 2010 | #131,379 | 129 | 0.04 | -9 bearers (-6.5%) | Down 14,544 places |
| 2020 | #150,205 | 109 | 0.04 | -20 bearers (-15.5%) | Down 18,826 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 Niewiarowski 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 | #131,379 | #150,205 | -14.3% |
| Count | 129 | 109 | -15.5% |
| Per 100K | 0.04 | 0.04 | -8.8% |
Between the 2010 and 2020 Census, the number of Niewiarowski bearers went from 129 to 109 (-15.5% change). The surname moved down 18,826 positions in the national ranking, going from #131,379 to #150,205.
FAQ
Niewiarowski surname: questions and answers
How many people in the U.S. have the surname Niewiarowski?
Name Census estimates that about 125 living Americans carry the surname Niewiarowski. Using the current population baseline, that works out to roughly 1 in 2,742,035 residents.
How common is Niewiarowski?
Niewiarowski ranks #150,205 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 109 people with the surname Niewiarowski. That is different from the site's living-bearer estimate (125), 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 Niewiarowski.
Has Niewiarowski become more or less common over time?
Between 2010 and 2020, the surname Niewiarowski went from 129 recorded bearers to 109. That is a decrease of 20 (-15.5%). In the national ranking it fell from #131,379 to #150,205.
What does the Census say about the background of Niewiarowski?
Among Census respondents with the surname Niewiarowski, the largest self-reported group is White at 93.6%. The next largest groups are Hispanic (6.4%). 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 Niewiarowski in the 2020 Census, accounting for 93.6% (102 people in the source table).
What is the full ancestry breakdown?
Niewiarowski appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (93.6%), Hispanic (6.4%). 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 Niewiarowski (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 Niewiarowski mean?
A Polish surname indicating the bearer's Jewish ancestry. 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 Niewiarowski (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 share the surname Niewiarowski?
For a quick modern estimate, our sister site HowManyOfMe.org answers that in one glance, with the living-bearer count front and centre.