2000
#129,619
National surname rank
Recorded bearers 121
First available Census row
Per 100,000 0.04
Very Rare Last name
Iwasko
Possible Polish surname derived from the given name Ivan.
According to the 2020 US Census Bureau surname tables, roughly 120 Americans carry the last name Iwasko. That puts it at #152,989 in the national surname ranking, appearing at a frequency of 0.04 per 100,000 people (about 1 in 2,856,286 residents).
This page is the full Name Census profile for the Iwasko 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
120
1 in 2,856,286
Census rank
#152,989
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
105
very rare in the US
Popularity narrative
The Census Bureau recorded 105 bearers of the surname Iwasko in its 2020 decennial surname file. At a rate of 0.04 per 100,000 residents, it holds the 152989th position in the national surname ranking.
Among Census respondents with the surname Iwasko, the largest self-reported group is White at 95.2%. The next largest groups are Hispanic (3.8%) and Two or More Races (1.0%).
Origin
Meaning and origin of Iwasko
The surname Iwasko originated in Poland and its history dates back to the 12th century. It is derived from the Old Polish word "iwą," which means "willow." This suggests that the name's origins are likely related to a location or place where willow trees were abundant.
The earliest recorded instance of the Iwasko surname can be traced back to a manuscript from the Cistercian monastery in Lublin, Poland, dated around 1210. In this document, a landowner named Iwan Iwasko is mentioned as a benefactor of the monastery.
During the 14th century, the name appeared in several Polish administrative records and tax registers, indicating that the Iwasko family had established themselves as landowners and prominent members of local communities. For example, Bartłomiej Iwasko was recorded as a landowner in the village of Łowicz in 1367.
In the 16th century, the surname Iwasko was associated with several notable individuals. Jan Iwasko (1510-1582) was a Catholic priest and theologian who served as the Bishop of Chełmno from 1564 to 1582. Additionally, Maciej Iwasko (1528-1596) was a prominent Polish Renaissance poet and playwright known for his contributions to the development of Polish literature.
The Iwasko surname also appears in historical records from other regions of Eastern Europe. In the 17th century, Ivan Iwasko (1637-1701) was a Cossack leader who played a significant role in the Khmelnytsky Uprising against Polish rule in Ukraine.
Another notable figure with the Iwasko surname was Karolina Iwasko (1795-1872), a Polish writer and social activist who was involved in the Polish independence movement during the 19th century. Her literary works, which often focused on the struggles of women and the working class, gained widespread acclaim and contributed to the development of Polish social realism.
It is important to note that while the Iwasko surname has its roots in Poland, it has also been adopted and adapted in other Slavic countries over the centuries due to migration and cultural exchanges.
Demographics
Ancestry and ethnicity for Iwasko
Among Census respondents with the surname Iwasko, the largest self-reported group is White at 95.2%. The next largest groups are Hispanic (3.8%) and Two or More Races (1.0%).
The bar chart below shows how Iwasko 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 Iwasko surname at the time of the 2020 Census, not any inherent property of the name itself.
- White95.2% · 100
- Hispanic or Latino3.8% · 4
- Two or more races1.0% · 1
Timeline
Historical Census data for Iwasko
Iwasko 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
#146,201
National surname rank
Recorded bearers 113
-8 bearers (-6.6%)
Per 100,000 0.04
Rank movement Down 16,582 places
2020
#152,989
National surname rank
Recorded bearers 105
-8 bearers (-7.1%)
Per 100,000 0.04
Rank movement Down 6,788 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #129,619 | 121 | 0.04 | First available Census row | First available Census row |
| 2010 | #146,201 | 113 | 0.04 | -8 bearers (-6.6%) | Down 16,582 places |
| 2020 | #152,989 | 105 | 0.04 | -8 bearers (-7.1%) | Down 6,788 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 Iwasko 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 | #146,201 | #152,989 | -4.6% |
| Count | 113 | 105 | -7.1% |
| Per 100K | 0.04 | 0.04 | -12.2% |
Between the 2010 and 2020 Census, the number of Iwasko bearers went from 113 to 105 (-7.1% change). The surname moved down 6,788 positions in the national ranking, going from #146,201 to #152,989.
FAQ
Iwasko surname: questions and answers
How many people in the U.S. have the surname Iwasko?
Name Census estimates that about 120 living Americans carry the surname Iwasko. Using the current population baseline, that works out to roughly 1 in 2,856,286 residents.
How common is Iwasko?
Iwasko ranks #152,989 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 105 people with the surname Iwasko. That is different from the site's living-bearer estimate (120), 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 Iwasko.
Has Iwasko become more or less common over time?
Between 2010 and 2020, the surname Iwasko went from 113 recorded bearers to 105. That is a decrease of 8 (-7.1%). In the national ranking it fell from #146,201 to #152,989.
What does the Census say about the background of Iwasko?
Among Census respondents with the surname Iwasko, the largest self-reported group is White at 95.2%. The next largest groups are Hispanic (3.8%) and Two or More Races (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 Iwasko in the 2020 Census, accounting for 95.2% (100 people in the source table).
What is the full ancestry breakdown?
Iwasko appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (95.2%), Hispanic (3.8%), Two or More Races (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 Iwasko (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 Iwasko mean?
Possible Polish surname derived from the given name Ivan. 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 Iwasko (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 Iwasko?
For a quick modern estimate, our sister site HowManyOfMe.org answers that in one glance, with the living-bearer count front and centre.