2000
#111,119
National surname rank
Recorded bearers 147
First available Census row
Per 100,000 0.05
Very Rare Last name
Jaconski
A Polish surname derived from the personal name Jacob.
According to the 2020 US Census Bureau surname tables, roughly 133 Americans carry the last name Jaconski. That puts it at #145,028 in the national surname ranking, appearing at a frequency of 0.04 per 100,000 people (about 1 in 2,577,100 residents).
This page is the full Name Census profile for the Jaconski 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
133
1 in 2,577,100
Census rank
#145,028
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
116
very rare in the US
Popularity narrative
The Census Bureau recorded 116 bearers of the surname Jaconski in its 2020 decennial surname file. At a rate of 0.04 per 100,000 residents, it holds the 145028th position in the national surname ranking.
Among Census respondents with the surname Jaconski, the largest self-reported group is White at 94.0%. The next largest groups are Hispanic (3.4%) and Two or More Races (1.7%).
Origin
Meaning and origin of Jaconski
The surname Jaconski has its origins in Poland, with records dating back to the 12th century. It is believed to be derived from the Polish name "Jakub," which is the equivalent of the English name "Jacob." This name likely originated from the Hebrew biblical name "Ya'akov," meaning "supplanter."
One of the earliest recorded instances of the name Jaconski can be found in a document from the city of Krakow, dated 1275. This document mentions a man named "Jan Jaconski" who was a merchant in the city. The name was also found in various other records from the Polish regions of Silesia and Pomerania during the 13th and 14th centuries.
In the 16th century, the name Jaconski appeared in the records of the town of Tarnow, where a family of that name owned a large estate. One notable member of this family was Marcin Jaconski, born in 1542, who served as a councilor to King Sigismund III Vasa of Poland.
As the centuries passed, the Jaconski name spread to other parts of Europe through migration and trade. In the 18th century, a man named Tomasz Jaconski, born in 1712, was a renowned artist and painter in the city of Warsaw.
During the 19th century, several Jaconski families emigrated from Poland to the United States and other parts of the world. One of the earliest recorded instances of the name in the United States was in 1832, when a man named Stanislaw Jaconski arrived in New York City from Warsaw.
Other notable individuals with the surname Jaconski include Karol Jaconski, a Polish military officer who fought in the November Uprising against Russian rule in 1830-1831, and Wladyslaw Jaconski, a Polish composer and musician born in 1875 who was known for his works inspired by Polish folk music.
Demographics
Ancestry and ethnicity for Jaconski
Among Census respondents with the surname Jaconski, the largest self-reported group is White at 94.0%. The next largest groups are Hispanic (3.4%) and Two or More Races (1.7%).
The bar chart below shows how Jaconski 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 Jaconski surname at the time of the 2020 Census, not any inherent property of the name itself.
- White94.0% · 109
- Hispanic or Latino3.4% · 4
- Two or more races1.7% · 2
- Asian and Pacific Islander0.9% · 1
Timeline
Historical Census data for Jaconski
Jaconski 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
#123,064
National surname rank
Recorded bearers 140
-7 bearers (-4.8%)
Per 100,000 0.05
Rank movement Down 11,945 places
2020
#145,028
National surname rank
Recorded bearers 116
-24 bearers (-17.1%)
Per 100,000 0.04
Rank movement Down 21,964 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #111,119 | 147 | 0.05 | First available Census row | First available Census row |
| 2010 | #123,064 | 140 | 0.05 | -7 bearers (-4.8%) | Down 11,945 places |
| 2020 | #145,028 | 116 | 0.04 | -24 bearers (-17.1%) | Down 21,964 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 Jaconski 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 | #123,064 | #145,028 | -17.8% |
| Count | 140 | 116 | -17.1% |
| Per 100K | 0.05 | 0.04 | -22.4% |
Between the 2010 and 2020 Census, the number of Jaconski bearers went from 140 to 116 (-17.1% change). The surname moved down 21,964 positions in the national ranking, going from #123,064 to #145,028.
FAQ
Jaconski surname: questions and answers
How many people in the U.S. have the surname Jaconski?
Name Census estimates that about 133 living Americans carry the surname Jaconski. Using the current population baseline, that works out to roughly 1 in 2,577,100 residents.
How common is Jaconski?
Jaconski ranks #145,028 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 116 people with the surname Jaconski. That is different from the site's living-bearer estimate (133), 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 Jaconski.
Has Jaconski become more or less common over time?
Between 2010 and 2020, the surname Jaconski went from 140 recorded bearers to 116. That is a decrease of 24 (-17.1%). In the national ranking it fell from #123,064 to #145,028.
What does the Census say about the background of Jaconski?
Among Census respondents with the surname Jaconski, the largest self-reported group is White at 94.0%. The next largest groups are Hispanic (3.4%) and Two or More Races (1.7%). 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 Jaconski in the 2020 Census, accounting for 94.0% (109 people in the source table).
What is the full ancestry breakdown?
Jaconski appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (94.0%), Hispanic (3.4%), Two or More Races (1.7%). 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 Jaconski (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 Jaconski mean?
A Polish surname derived from the personal name Jacob. 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 Jaconski (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 have the surname Jaconski?
HowManyOfMe.org, our sister site, answers that with the living-bearer count in one glance.