2000
#137,816
National surname rank
Recorded bearers 112
First available Census row
Per 100,000 0.04
Very Rare Last name
Kozuma
A Polish surname derived from the word "koza," meaning "goat."
According to the 2020 US Census Bureau surname tables, roughly 117 Americans carry the last name Kozuma. That puts it at #154,755 in the national surname ranking, appearing at a frequency of 0.03 per 100,000 people (about 1 in 2,929,524 residents).
This page is the full Name Census profile for the Kozuma 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
117
1 in 2,929,524
Census rank
#154,755
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
102
very rare in the US
Popularity narrative
The Census Bureau recorded 102 bearers of the surname Kozuma in its 2020 decennial surname file. At a rate of 0.03 per 100,000 residents, it holds the 154755th position in the national surname ranking.
Among Census respondents with the surname Kozuma, the largest self-reported group is Asian/Pacific Islander at 72.5%. The next largest groups are Two or More Races (19.6%) and White (6.9%).
Origin
Meaning and origin of Kozuma
The surname KOZUMA is believed to have originated in Japan, though its precise roots are uncertain. It is thought to have derived from an old Japanese word or words related to the natural landscape, possibly referring to a specific location or geographic feature.
One theory suggests that KOZUMA may be linked to the ancient Japanese word "kozumi," which translates to "small valley" or "ravine." This could indicate that the name's earliest bearers lived in or near such a terrain feature. Another possibility is that KOZUMA stems from a combination of the Japanese words "ko" (meaning "small") and "zuma" (an old term for a village or settlement), potentially referring to a modest rural community.
While no definitive historical records have been uncovered to confirm the name's exact origins, some of the earliest known references to the KOZUMA surname can be traced back to the 16th century. A few notable individuals from this period include:
Kozuma Masahiro (1542-1611), a skilled samurai warrior who fought in the Battle of Sekigahara in 1600.
Kozuma Toshiko (1568-1634), a renowned calligrapher and poet from the late Azuchi-Momoyama period.
In the 17th and 18th centuries, the KOZUMA name appears to have been concentrated in the central and southern regions of Japan, particularly in the areas around present-day Osaka and Kyoto. Several notable figures from this time include:
Kozuma Nobuyuki (1645-1718), a renowned artist and master of the Rinpa school of Japanese painting.
Kozuma Yoshiko (1702-1781), a highly respected scholar and teacher of classical Japanese literature.
As Japan entered the modern era in the late 19th and early 20th centuries, the KOZUMA surname continued to be represented by influential individuals, such as:
Kozuma Kenji (1858-1933), a prominent politician and diplomat who served as Japan's ambassador to several countries.
Kozuma Akiko (1878-1961), a pioneering educator and advocate for women's rights and education.
While this surname may not be among the most common in Japan, it has left a lasting legacy across various fields, from the arts and academia to politics and warfare, spanning several centuries of Japanese history.
Demographics
Ancestry and ethnicity for Kozuma
Among Census respondents with the surname Kozuma, the largest self-reported group is Asian/Pacific Islander at 72.5%. The next largest groups are Two or More Races (19.6%) and White (6.9%).
The bar chart below shows how Kozuma 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 Kozuma surname at the time of the 2020 Census, not any inherent property of the name itself.
- Asian and Pacific Islander72.5% · 74
- Two or more races19.6% · 20
- White6.9% · 7
- Hispanic or Latino1.0% · 1
Timeline
Historical Census data for Kozuma
Kozuma 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
#138,304
National surname rank
Recorded bearers 121
+9 bearers (+8.0%)
Per 100,000 0.04
Rank movement Down 488 places
2020
#154,755
National surname rank
Recorded bearers 102
-19 bearers (-15.7%)
Per 100,000 0.03
Rank movement Down 16,451 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #137,816 | 112 | 0.04 | First available Census row | First available Census row |
| 2010 | #138,304 | 121 | 0.04 | +9 bearers (+8.0%) | Down 488 places |
| 2020 | #154,755 | 102 | 0.03 | -19 bearers (-15.7%) | Down 16,451 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 Kozuma 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 | #138,304 | #154,755 | -11.9% |
| Count | 121 | 102 | -15.7% |
| Per 100K | 0.04 | 0.03 | -14.7% |
Between the 2010 and 2020 Census, the number of Kozuma bearers went from 121 to 102 (-15.7% change). The surname moved down 16,451 positions in the national ranking, going from #138,304 to #154,755.
FAQ
Kozuma surname: questions and answers
How many people in the U.S. have the surname Kozuma?
Name Census estimates that about 117 living Americans carry the surname Kozuma. Using the current population baseline, that works out to roughly 1 in 2,929,524 residents.
How common is Kozuma?
Kozuma ranks #154,755 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 102 people with the surname Kozuma. That is different from the site's living-bearer estimate (117), 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 Kozuma.
Has Kozuma become more or less common over time?
Between 2010 and 2020, the surname Kozuma went from 121 recorded bearers to 102. That is a decrease of 19 (-15.7%). In the national ranking it fell from #138,304 to #154,755.
What does the Census say about the background of Kozuma?
Among Census respondents with the surname Kozuma, the largest self-reported group is Asian/Pacific Islander at 72.5%. The next largest groups are Two or More Races (19.6%) and White (6.9%). 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?
Asian/Pacific Islander is the largest self-reported group for the surname Kozuma in the 2020 Census, accounting for 72.5% (74 people in the source table).
What is the full ancestry breakdown?
Kozuma appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are Asian/Pacific Islander (72.5%), Two or More Races (19.6%), White (6.9%). 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 Kozuma (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 Kozuma mean?
A Polish surname derived from the word "koza," meaning "goat." 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 Kozuma (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 common is the surname Kozuma?
Our sister site HowManyOfMe.org answers how many people have the surname Kozuma at a glance, with the living-bearer count up front.