2010
#150,452
National surname rank
Recorded bearers 109
First available Census row
Per 100,000 0.04
Very Rare Last name
Kloza
A Polish surname derived from the Polish word "kloc" meaning log or block of wood.
According to the 2020 US Census Bureau surname tables, roughly 114 Americans carry the last name Kloza. That puts it at #156,005 in the national surname ranking, appearing at a frequency of 0.03 per 100,000 people (about 1 in 3,006,617 residents).
This page is the full Name Census profile for the Kloza 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
114
1 in 3,006,617
Census rank
#156,005
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
99
very rare in the US
Popularity narrative
The Census Bureau recorded 99 bearers of the surname Kloza in its 2020 decennial surname file. At a rate of 0.03 per 100,000 residents, it holds the 156005th position in the national surname ranking.
Among Census respondents with the surname Kloza, the largest self-reported group is White at 92.9%. The next largest groups are Hispanic (5.1%) and Asian/Pacific Islander (1.0%).
Origin
Meaning and origin of Kloza
The surname Kloza is of Polish origin, with roots tracing back to the late medieval period in the region known today as western Poland. It is believed to have derived from the Old Polish word "klóz," which referred to a type of wooden lock or latch used on doors and gates.
The earliest known record of the name appears in a 15th-century land registry from the town of Kościan, where a certain Jan Kloza is listed as a landowner. This suggests that the name may have originated as an occupational surname, possibly denoting a craftsman who specialized in the making of these wooden locks.
Throughout the 16th and 17th centuries, the Kloza name can be found scattered across various historical documents from the Polish-Lithuanian Commonwealth, particularly in the regions of Greater Poland and Silesia. Variations in spelling, such as Kloza, Kłoza, and Kłoza, were common during this period.
One notable bearer of the name was Andrzej Kloza (c. 1540-1608), a Polish nobleman and military commander who fought in the Livonian War against Sweden and Russia. He is mentioned in several chronicles of the time for his valor and leadership on the battlefield.
In the 18th century, the Kloza surname gained prominence in the town of Leszno, where a family of merchants and landowners bearing the name established themselves as a local power. Jakub Kloza (1712-1789), a successful trader and philanthropist, is remembered for his contributions to the town's economic and cultural development.
Another influential figure was Franciszek Kloza (1796-1867), a Polish poet and writer who was part of the Romantic literary movement. His works, which often celebrated Polish nationalism and independence, earned him a place among the country's esteemed literary figures of the 19th century.
In more recent times, the Kloza name has continued to be prevalent in Poland, with notable bearers including Katarzyna Kloza (1962-), a renowned Polish actress and singer, and Marek Kloza (1974-), a former professional soccer player who represented Poland's national team in the late 1990s.
Demographics
Ancestry and ethnicity for Kloza
Among Census respondents with the surname Kloza, the largest self-reported group is White at 92.9%. The next largest groups are Hispanic (5.1%) and Asian/Pacific Islander (1.0%).
The bar chart below shows how Kloza 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 Kloza surname at the time of the 2020 Census, not any inherent property of the name itself.
- White92.9% · 92
- Hispanic or Latino5.1% · 5
- Asian and Pacific Islander1.0% · 1
- American Indian and Alaska Native1.0% · 1
Timeline
Historical Census data for Kloza
Kloza 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
#156,005
National surname rank
Recorded bearers 99
-10 bearers (-9.2%)
Per 100,000 0.03
Rank movement Down 5,553 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2010 | #150,452 | 109 | 0.04 | First available Census row | First available Census row |
| 2020 | #156,005 | 99 | 0.03 | -10 bearers (-9.2%) | Down 5,553 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 Kloza 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 | #150,452 | #156,005 | -3.7% |
| Count | 109 | 99 | -9.2% |
| Per 100K | 0.04 | 0.03 | -17.2% |
Between the 2010 and 2020 Census, the number of Kloza bearers went from 109 to 99 (-9.2% change). The surname moved down 5,553 positions in the national ranking, going from #150,452 to #156,005.
FAQ
Kloza surname: questions and answers
How many people in the U.S. have the surname Kloza?
Name Census estimates that about 114 living Americans carry the surname Kloza. Using the current population baseline, that works out to roughly 1 in 3,006,617 residents.
How common is Kloza?
Kloza ranks #156,005 in the 2020 Census surname tables and is classified on this site as "Very Rare." The Census recorded the name at a frequency of 0.03 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 99 people with the surname Kloza. That is different from the site's living-bearer estimate (114), which projects the surname's present-day count by applying the Census frequency rate to the current U.S. population.
What does 0.03 per 100,000 actually mean?
It is the Census Bureau's normalized frequency measure. A rate of 0.03 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 Kloza.
Has Kloza become more or less common over time?
Between 2010 and 2020, the surname Kloza went from 109 recorded bearers to 99. That is a decrease of 10 (-9.2%). In the national ranking it fell from #150,452 to #156,005.
What does the Census say about the background of Kloza?
Among Census respondents with the surname Kloza, the largest self-reported group is White at 92.9%. The next largest groups are Hispanic (5.1%) 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 Kloza in the 2020 Census, accounting for 92.9% (92 people in the source table).
What is the full ancestry breakdown?
Kloza appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (92.9%), Hispanic (5.1%), 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 Kloza (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 Kloza mean?
A Polish surname derived from the Polish word "kloc" meaning log or block of wood. 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 Kloza (0.03 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 Kloza?
For a quick modern take, check how many people are called Kloza on our sister site HowManyOfMe.org.