2000
#132,259
National surname rank
Recorded bearers 118
First available Census row
Per 100,000 0.04
Very Rare Last name
Trojcak
An East Slavic surname likely referring to someone from the village of Trojca.
According to the 2020 US Census Bureau surname tables, roughly 112 Americans carry the last name Trojcak. That puts it at #156,269 in the national surname ranking, appearing at a frequency of 0.03 per 100,000 people (about 1 in 3,060,307 residents).
This page is the full Name Census profile for the Trojcak 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
112
1 in 3,060,307
Census rank
#156,269
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
98
very rare in the US
Popularity narrative
The Census Bureau recorded 98 bearers of the surname Trojcak in its 2020 decennial surname file. At a rate of 0.03 per 100,000 residents, it holds the 156269th position in the national surname ranking.
Among Census respondents with the surname Trojcak, the largest self-reported group is White at 99.0%. The next largest groups are Two or More Races (1.0%).
Origin
Meaning and origin of Trojcak
The surname Trojcak originates from the Czech Republic and Slovakia, with roots dating back to the 15th century. The name is derived from the Czech word "trojka," meaning "three," and is believed to have initially referred to a person or family associated with the number three or a specific location with a connection to that number.
The earliest known record of the Trojcak surname appears in a 16th-century document from the Moravian region of what is now the Czech Republic. This document mentions a landowner named Jan Trojcak, who owned property in the village of Trojcice, which translates to "the place of three." This village name likely influenced the surname's evolution.
In the 17th century, the Trojcak name gained prominence in the town of Třebíč, located in the Vysočina region of the Czech Republic. During this period, a notable figure named Vaclav Trojcak (1620-1692) served as a respected magistrate and played a significant role in the town's governance.
As the surname spread across Central Europe, variations in spelling emerged, including Troycak, Troyczak, and Troitschak. These variations reflect regional linguistic influences and the challenges of standardized spelling during that era.
Another prominent individual bearing the Trojcak surname was Frantisek Trojcak (1738-1804), a Czech composer and organist who made significant contributions to the development of baroque music in the region.
In the 19th century, the Trojcak name appeared in records from the Austro-Hungarian Empire, particularly in the regions of present-day Slovakia and eastern Czech Republic. One notable figure from this period was Karel Trojcak (1872-1935), a Czech politician and activist who advocated for workers' rights and social reform.
During the 20th century, the Trojcak surname continued to be found across Central Europe, with notable individuals such as Josef Trojcak (1914-1998), a Czech resistance fighter during World War II, and Zdenka Trojcakova (1928-2006), a renowned Czech actress and theater director.
While the surname Trojcak has its roots in the Czech Republic and Slovakia, it has since spread to other parts of the world through emigration and diaspora communities. However, its origins and historical significance remain deeply rooted in the cultural heritage of Central Europe.
Demographics
Ancestry and ethnicity for Trojcak
Among Census respondents with the surname Trojcak, the largest self-reported group is White at 99.0%. The next largest groups are Two or More Races (1.0%).
The bar chart below shows how Trojcak 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 Trojcak surname at the time of the 2020 Census, not any inherent property of the name itself.
- White99.0% · 97
- Two or more races1.0% · 1
Timeline
Historical Census data for Trojcak
Trojcak 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
#133,863
National surname rank
Recorded bearers 126
+8 bearers (+6.8%)
Per 100,000 0.04
Rank movement Down 1,604 places
2020
#156,269
National surname rank
Recorded bearers 98
-28 bearers (-22.2%)
Per 100,000 0.03
Rank movement Down 22,406 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #132,259 | 118 | 0.04 | First available Census row | First available Census row |
| 2010 | #133,863 | 126 | 0.04 | +8 bearers (+6.8%) | Down 1,604 places |
| 2020 | #156,269 | 98 | 0.03 | -28 bearers (-22.2%) | Down 22,406 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 Trojcak 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 | #133,863 | #156,269 | -16.7% |
| Count | 126 | 98 | -22.2% |
| Per 100K | 0.04 | 0.03 | -18.0% |
Between the 2010 and 2020 Census, the number of Trojcak bearers went from 126 to 98 (-22.2% change). The surname moved down 22,406 positions in the national ranking, going from #133,863 to #156,269.
FAQ
Trojcak surname: questions and answers
How many people in the U.S. have the surname Trojcak?
Name Census estimates that about 112 living Americans carry the surname Trojcak. Using the current population baseline, that works out to roughly 1 in 3,060,307 residents.
How common is Trojcak?
Trojcak ranks #156,269 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 98 people with the surname Trojcak. That is different from the site's living-bearer estimate (112), 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 Trojcak.
Has Trojcak become more or less common over time?
Between 2010 and 2020, the surname Trojcak went from 126 recorded bearers to 98. That is a decrease of 28 (-22.2%). In the national ranking it fell from #133,863 to #156,269.
What does the Census say about the background of Trojcak?
Among Census respondents with the surname Trojcak, the largest self-reported group is White at 99.0%. The next largest groups are 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 Trojcak in the 2020 Census, accounting for 99.0% (97 people in the source table).
What is the full ancestry breakdown?
Trojcak appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (99.0%), 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 Trojcak (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 Trojcak mean?
An East Slavic surname likely referring to someone from the village of Trojca. 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 Trojcak (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 surname Trojcak?
HowManyOfMe.org, our sister site, answers that with the living-bearer count in one glance.