2000
#119,644
National surname rank
Recorded bearers 134
First available Census row
Per 100,000 0.05
Very Rare Last name
Sedlacko
A surname of Slovak origin, meaning someone from a rural or peasant class.
According to the 2020 US Census Bureau surname tables, roughly 139 Americans carry the last name Sedlacko. That puts it at #141,309 in the national surname ranking, appearing at a frequency of 0.04 per 100,000 people (about 1 in 2,465,859 residents).
This page is the full Name Census profile for the Sedlacko 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
139
1 in 2,465,859
Census rank
#141,309
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
121
very rare in the US
Popularity narrative
The Census Bureau recorded 121 bearers of the surname Sedlacko in its 2020 decennial surname file. At a rate of 0.04 per 100,000 residents, it holds the 141309th position in the national surname ranking.
Among Census respondents with the surname Sedlacko, the largest self-reported group is White at 94.2%. The next largest groups are Hispanic (3.3%) and Asian/Pacific Islander (0.8%).
Origin
Meaning and origin of Sedlacko
The surname Sedlacko has its origins in the Czech Republic, emerging around the 14th century. It is derived from the Czech word "sedlak," meaning "farmer" or "peasant." This suggests that the earliest bearers of this name were likely involved in agricultural pursuits or belonged to the peasantry class.
One of the earliest recorded instances of the Sedlacko surname can be found in the Codex Diplomaticus et Epistolaris Regni Bohemiae, a collection of historical documents and records from the Kingdom of Bohemia, now part of the Czech Republic. In this codex, dated back to the late 14th century, there is a mention of a certain "Jan Sedlacko" from the village of Straznice.
The Sedlacko name has also been associated with various place names in the Czech Republic. For instance, there is a village called Sedlackov, located in the Zlin Region, which may have contributed to the surname's evolution. Additionally, the name bears similarities to other Czech surnames, such as Sedlacek and Sedlak, which share the same root word and meaning.
Throughout history, several notable individuals have borne the Sedlacko surname. One such figure was Vaclav Sedlacko (1578-1639), a Czech priest and scholar who authored several theological works and served as a canon in the city of Olomouc. Another prominent bearer of this name was Jan Sedlacko (1712-1785), a Czech painter and engraver known for his religious artwork and portraits.
In the 19th century, Frantisek Sedlacko (1834-1891) gained recognition as a Czech writer and journalist, contributing to various literary publications and advocating for Czech nationalism. Another individual of note was Karel Sedlacko (1872-1936), a Czech architect who designed several notable buildings in Prague, including the Municipal House and the Vinohrady Theatre.
More recently, Jaroslav Sedlacko (1924-2018) was a Czech artist and illustrator renowned for his children's book illustrations and whimsical depictions of fairy tales and folklore.
While the Sedlacko surname may have its humble beginnings rooted in the agricultural communities of the Czech lands, it has since been carried by individuals across various professions and fields, leaving an indelible mark on the cultural and historical tapestry of the region.
Demographics
Ancestry and ethnicity for Sedlacko
Among Census respondents with the surname Sedlacko, the largest self-reported group is White at 94.2%. The next largest groups are Hispanic (3.3%) and Asian/Pacific Islander (0.8%).
The bar chart below shows how Sedlacko 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 Sedlacko surname at the time of the 2020 Census, not any inherent property of the name itself.
- White94.2% · 114
- Hispanic or Latino3.3% · 4
- Asian and Pacific Islander0.8% · 1
- American Indian and Alaska Native0.8% · 1
- Two or more races0.8% · 1
Timeline
Historical Census data for Sedlacko
Sedlacko 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
#125,282
National surname rank
Recorded bearers 137
+3 bearers (+2.2%)
Per 100,000 0.05
Rank movement Down 5,638 places
2020
#141,309
National surname rank
Recorded bearers 121
-16 bearers (-11.7%)
Per 100,000 0.04
Rank movement Down 16,027 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #119,644 | 134 | 0.05 | First available Census row | First available Census row |
| 2010 | #125,282 | 137 | 0.05 | +3 bearers (+2.2%) | Down 5,638 places |
| 2020 | #141,309 | 121 | 0.04 | -16 bearers (-11.7%) | Down 16,027 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 Sedlacko 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 | #125,282 | #141,309 | -12.8% |
| Count | 137 | 121 | -11.7% |
| Per 100K | 0.05 | 0.04 | -19.0% |
Between the 2010 and 2020 Census, the number of Sedlacko bearers went from 137 to 121 (-11.7% change). The surname moved down 16,027 positions in the national ranking, going from #125,282 to #141,309.
FAQ
Sedlacko surname: questions and answers
How many people in the U.S. have the surname Sedlacko?
Name Census estimates that about 139 living Americans carry the surname Sedlacko. Using the current population baseline, that works out to roughly 1 in 2,465,859 residents.
How common is Sedlacko?
Sedlacko ranks #141,309 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 121 people with the surname Sedlacko. That is different from the site's living-bearer estimate (139), 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 Sedlacko.
Has Sedlacko become more or less common over time?
Between 2010 and 2020, the surname Sedlacko went from 137 recorded bearers to 121. That is a decrease of 16 (-11.7%). In the national ranking it fell from #125,282 to #141,309.
What does the Census say about the background of Sedlacko?
Among Census respondents with the surname Sedlacko, the largest self-reported group is White at 94.2%. The next largest groups are Hispanic (3.3%) and Asian/Pacific Islander (0.8%). 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 Sedlacko in the 2020 Census, accounting for 94.2% (114 people in the source table).
What is the full ancestry breakdown?
Sedlacko appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (94.2%), Hispanic (3.3%), Asian/Pacific Islander (0.8%). 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 Sedlacko (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 Sedlacko mean?
A surname of Slovak origin, meaning someone from a rural or peasant class. 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 Sedlacko (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 Sedlacko?
For a faster, more casual read, check HowManyOfMe.org — our sister site built around that single question.