2000
#134,037
National surname rank
Recorded bearers 116
First available Census row
Per 100,000 0.04
Very Rare Last name
Joniak
A surname of Polish origin meaning "son of Joniak" or "son of John".
According to the 2020 US Census Bureau surname tables, roughly 135 Americans carry the last name Joniak. That puts it at #143,511 in the national surname ranking, appearing at a frequency of 0.04 per 100,000 people (about 1 in 2,538,921 residents).
This page is the full Name Census profile for the Joniak 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
135
1 in 2,538,921
Census rank
#143,511
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
118
very rare in the US
Popularity narrative
The Census Bureau recorded 118 bearers of the surname Joniak in its 2020 decennial surname file. At a rate of 0.04 per 100,000 residents, it holds the 143511th position in the national surname ranking.
Among Census respondents with the surname Joniak, the largest self-reported group is White at 83.1%. The next largest groups are Hispanic (7.6%) and Two or More Races (7.6%).
Origin
Meaning and origin of Joniak
The surname Joniak originates from Poland and is believed to have roots dating back to the 16th century. It is derived from the Polish word "jonka," which means "violet" or "pansy." The name was likely first adopted by someone who lived near a field of violets or worked with these flowers.
One of the earliest recorded instances of the Joniak name appears in a parish registry from the village of Grodzisk Mazowiecki, located near Warsaw, in the year 1612. The entry lists a Maciej Joniak as a resident of the village. It is possible that the name had already been established in the region for some time before this record.
In the 18th century, the Joniak name can be found in several Polish military records, suggesting that individuals with this surname served in various military campaigns during this period. One notable example is Józef Joniak, a soldier who fought in the Kościuszko Uprising against Russian forces in 1794.
The name Joniak has also been linked to certain geographic locations in Poland, such as the village of Joniaki located in the Podlaskie Voivodeship. It is possible that the name originated from this particular place name or that individuals from this area adopted the surname.
Among notable individuals with the surname Joniak throughout history are:
1. Tomasz Joniak (1858-1932), a Polish painter and illustrator known for his landscapes and genre scenes.
2. Janina Joniak (1886-1967), a Polish actress and theater director who founded the renowned Joniak Theater in Warsaw.
3. Kazimierz Joniak (1920-2002), a Polish resistance fighter during World War II and a recipient of the Virtuti Militari, Poland's highest military decoration.
4. Krzysztof Joniak (born 1960), a Polish football player who represented the national team in the 1986 FIFA World Cup.
5. Katarzyna Joniak (born 1985), a contemporary Polish writer and poet, known for her critically acclaimed poetry collections.
While the Joniak surname is relatively uncommon outside of Poland, it has a rich history and significance within the country's cultural and historical fabric.
Demographics
Ancestry and ethnicity for Joniak
Among Census respondents with the surname Joniak, the largest self-reported group is White at 83.1%. The next largest groups are Hispanic (7.6%) and Two or More Races (7.6%).
The bar chart below shows how Joniak 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 Joniak surname at the time of the 2020 Census, not any inherent property of the name itself.
- White83.1% · 98
- Hispanic or Latino7.6% · 9
- Two or more races7.6% · 9
- Black or African American0.8% · 1
- Asian and Pacific Islander0.8% · 1
Timeline
Historical Census data for Joniak
Joniak 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
+10 bearers (+8.6%)
Per 100,000 0.04
Rank movement Up 174 places
2020
#143,511
National surname rank
Recorded bearers 118
-8 bearers (-6.3%)
Per 100,000 0.04
Rank movement Down 9,648 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #134,037 | 116 | 0.04 | First available Census row | First available Census row |
| 2010 | #133,863 | 126 | 0.04 | +10 bearers (+8.6%) | Up 174 places |
| 2020 | #143,511 | 118 | 0.04 | -8 bearers (-6.3%) | Down 9,648 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 Joniak 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 | #143,511 | -7.2% |
| Count | 126 | 118 | -6.3% |
| Per 100K | 0.04 | 0.04 | -1.3% |
Between the 2010 and 2020 Census, the number of Joniak bearers went from 126 to 118 (-6.3% change). The surname moved down 9,648 positions in the national ranking, going from #133,863 to #143,511.
FAQ
Joniak surname: questions and answers
How many people in the U.S. have the surname Joniak?
Name Census estimates that about 135 living Americans carry the surname Joniak. Using the current population baseline, that works out to roughly 1 in 2,538,921 residents.
How common is Joniak?
Joniak ranks #143,511 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 118 people with the surname Joniak. That is different from the site's living-bearer estimate (135), 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 Joniak.
Has Joniak become more or less common over time?
Between 2010 and 2020, the surname Joniak went from 126 recorded bearers to 118. That is a decrease of 8 (-6.3%). In the national ranking it fell from #133,863 to #143,511.
What does the Census say about the background of Joniak?
Among Census respondents with the surname Joniak, the largest self-reported group is White at 83.1%. The next largest groups are Hispanic (7.6%) and Two or More Races (7.6%). 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 Joniak in the 2020 Census, accounting for 83.1% (98 people in the source table).
What is the full ancestry breakdown?
Joniak appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (83.1%), Hispanic (7.6%), Two or More Races (7.6%). 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 Joniak (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 Joniak mean?
A surname of Polish origin meaning "son of Joniak" or "son of John". 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 Joniak (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 share the surname Joniak?
For a faster, more casual read, check HowManyOfMe.org — our sister site built around that single question.