Tadeusz
A masculine Polish name derived from the Latin name Thaddaeus, meaning "heart" or "courageous".
Name Census estimates that about 211 living Americans carry the first name Tadeusz. The name is used almost exclusively for boys. The average person named Tadeusz today is around 35 years old, and the year with the single highest number of Tadeusz births was 1917 (26 babies).
This page is the full Name Census profile for Tadeusz. Below you will find a gender breakdown showing how the name splits between male and female registrations, a year-by-year popularity chart stretching back to 1880, decade-level totals, the top US states for this name, its meaning and etymology, and a set of frequently asked questions with data-backed answers.
For a British comparison, Name Census UK has a UK baby-name profile for Tadeusz with official rankings and popularity over time.
People living today
211
~ 1 in 1,624,428 Americans
Peak year
1917
26 babies that year
Average age
35
years old
2024 SSA rank
#13,944
Tracked since 1912
Census
Tadeusz in the 2020 Census
The 2020 Census recorded 2,694 people with the first name Tadeusz, which placed it at #6,069 in the published first-name tables. This is a snapshot of people who already had the name at the time of the Census.
The SSA sections elsewhere on this page answer a different question: how often parents gave the name to babies over time. The "people living today" figure on this page is different again: it is a current estimate built from SSA birth records and age-based survival rates, so the two numbers are not expected to match exactly.
2020 Census rank
#6,069
National first-name rank
People counted
2.7K
2,694 in the published race/origin table
Per 100,000
0.9
People with this name in 2020
Largest reported group
White
98.9% of people with this name
Demographics
Ancestry and ethnicity for Tadeusz
In the 2020 Census race and Hispanic-origin table, the largest reported group for people named Tadeusz is White at 98.9%. The next largest groups are Hispanic (0.8%) and Two or More Races (0.2%). These figures describe the people who had the name in 2020, not any inherent property of the name itself.
The bar chart below shows how people with the first name Tadeusz 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 name, the Bureau suppresses the figure to protect individual privacy, which is why some names show fewer than six slices.
Percentages are shown so the breakdown is easy to read across every published category. Because the 2020 Census first-name file also includes raw headcounts for each group, Name Census can show those alongside the percentages in the legend and hover tooltip.
Keep in mind that these are self-reported numbers. A first name does not determine a person's race or ethnicity, and the distribution you see here reflects the specific population who happened to carry the name Tadeusz at the time of the 2020 Census, not any inherent property of the name itself.
- White98.9% · 2,664
- Hispanic or Latino0.8% · 21
- Two or more races0.2% · 6
- Asian and Pacific Islander0.1% · 3
Popularity
Tadeusz: popularity over time
The SSA tracks Tadeusz from the 1910s through to the 2020s, spanning 11 decades of birth certificate data. The biggest single decade for the name was the 1910s, with 101 total registrations. Although the numbers have come down from the 1910s peak, Tadeusz remains solidly in use and shows no sign of disappearing from maternity wards.
Babies born per year
Decades
Tadeusz by decade
The table below breaks the full SSA timeline into ten-year windows. Each row shows how many male and female babies were given the name Tadeusz during that decade, along with a combined total. This is useful for spotting eras where the name surged or retreated.
Geography
Where Tadeusz' live
Origin
Meaning and history of Tadeusz
Tadeusz is a Polish name derived from the Latin name Thaddaeus, which itself originated from the Aramaic name Tadday or Tedday. The name is believed to have been derived from the Aramaic word "tad," meaning "breast" or "openhearted." This suggests that the name may have initially been a descriptive nickname referring to someone who was kind, generous, or nurturing.
The name Tadeusz has a long history, dating back to the 1st century AD when it was used by Saint Jude Thaddeus, one of the twelve apostles of Jesus Christ. In the Bible, Jude Thaddeus is referred to as "Judas, not Iscariot" and is the author of the Epistle of Jude in the New Testament.
One of the earliest recorded instances of the name Tadeusz comes from the 12th century, when it was used by Tadeusz Kościelecki, a Polish nobleman and military commander who fought against the Teutonic Knights in the 13th century.
Throughout history, several notable figures have borne the name Tadeusz. One of the most famous was Tadeusz Kościuszko (1746-1817), a Polish military leader and revolutionary who played a significant role in the American Revolutionary War and the Polish-Lithuanian Commonwealth's struggle for independence.
Another prominent figure was Tadeusz Rejtan (1742-1780), a Polish nobleman and politician who gained fame for his dramatic protest against the First Partition of Poland in 1773. Rejtan's act of defiance has become an enduring symbol of Polish patriotism and resistance against foreign oppression.
In the realm of literature, Tadeusz Różewicz (1921-2014) was a renowned Polish poet, playwright, and prose writer who was a prominent figure in the Polish avant-garde movement. His works often explored themes of war, suffering, and the human condition.
Tadeusz Mazowiecki (1927-2013) was a Polish writer, journalist, and politician who served as the first non-communist Prime Minister of Poland after the fall of communism in 1989. He played a pivotal role in Poland's transition to democracy and was widely respected for his commitment to human rights and civil liberties.
Finally, Tadeusz Kantor (1915-1990) was a Polish painter, assemblage artist, and theatre practitioner who is widely regarded as one of the most influential avant-garde artists of the 20th century. His innovative approach to theatre, which he termed "Theatre of Death," challenged traditional conventions and explored themes of memory, death, and the human condition.
People
Tadeusz + last name combinations
How many people share a full name with Tadeusz as the first name? Click a combination below to see the estimate, or search any pairing.
Related
Other names starting with T
Other first names starting with T with a similar number of bearers.
FAQ
Tadeusz: questions and answers
How many people in the U.S. are named Tadeusz?
Name Census puts the figure at roughly 211 living Americans. We arrive at this by taking every SSA birth registration for Tadeusz going back to 1880 and adjusting each cohort for expected survival using CDC actuarial life tables. The result is an age-weighted living-bearer count, not a raw birth total. That works out to about 1 in 1,624,428 US residents.
Is Tadeusz a common name?
We classify Tadeusz as "Very Rare". It ranks above 74.9% of all first names in the SSA dataset by living bearers. Across the full history of the data, 423 babies have been registered with this name.
When was Tadeusz most popular?
The single biggest year for Tadeusz was 1917, when 26 babies received the name. The fact that the average living Tadeusz is about 35 years old gives you a rough sense of which era contributed the most bearers who are still alive today.
How common was Tadeusz in the 2020 Census?
The published 2020 Census first-name tables recorded 2,694 people with the name Tadeusz, or 0.89 per 100,000 residents. That placed it at #6,069 in the national Census ranking for first names.
Why is the Census count different from the living estimate?
Because they measure different things. The Census figure is a count of people who had the name Tadeusz in 2020. The living estimate aims to answer a current question instead: how many people with the name are alive today, based on SSA birth records and age-based survival rates. Since one number is a 2020 snapshot and the other is a present-day estimate, they are not expected to be identical.
What does the Census say about the gender split for Tadeusz?
In the 2020 Census sex table, Tadeusz appears almost entirely male. Of the 2,696 people counted with this name, 99.9% were male and only a very small share were female. The Census view is a snapshot of people living with the name in 2020, while the SSA section above tracks births across time.
What does the Census say about the background of people named Tadeusz?
In the 2020 Census race and Hispanic-origin table, the largest reported group for people named Tadeusz is White at 98.9%. The next largest groups are Hispanic (0.8%) and Two or More Races (0.2%). These figures describe the people who had the name in 2020, not any inherent property of the name itself. The percentages in the chart above come from self-reported race and Hispanic-origin responses in the 2020 Census.
Which group reports the name Tadeusz most often in the Census?
White is the largest reported group for people named Tadeusz in the 2020 Census, accounting for 98.9% (2,664 people in the published table).
Why can the Census sex total and race total differ slightly?
The Census Bureau published separate 2020 tables for sex and for race/Hispanic origin, and the released figures can differ slightly because of privacy protection in the public files. That is why this page treats the gender section and the race/origin section as two related snapshots instead of forcing them into one identical total.
Does every first name have Census demographic data?
No. The public Census first-name release only includes names that met the Bureau's publication rules, so many rarer names in the SSA files have no Census demographic snapshot. When that happens, the SSA trend, gender history, and state sections still appear, but the 2020 Census demographic sections are omitted.
What does the SSA popularity chart show?
The chart tracks births, not the number of people alive with the name today. Each point shows how many babies were given the name Tadeusz in that year. That makes it useful for spotting when the name rose, peaked, or faded.
Is Tadeusz a male name?
Yes, 100.0% of people registered as Tadeusz in the SSA data are male. You can see the full per-sex comparison in the gender distribution section above, which includes the latest year rank, birth count, and peak year for each sex.
Is Tadeusz still being used today?
Yes. The SSA still recorded Tadeusz in 2024, and the page above shows its latest-year rank where available. A name can be well past its peak and still remain in steady use, especially if it built up a large population over earlier decades.
Why can a name have a lot of living bearers even if it is not trendy now?
Because living-bearer counts and current baby-name popularity measure different things. A name like Tadeusz can build up a very large population over many decades, even if fewer parents are choosing it now than they did at its peak.
Where does this data come from?
First-name figures come from the Social Security Administration's national baby name files, which cover every name on a birth certificate from 1880 to 2024. Living-bearer estimates layer in CDC actuarial life tables broken out by sex to account for mortality. The population baseline (342,754,338) is the Census Bureau's latest national estimate. You can read the full calculation on our methodology page.
How many people have the name Tadeusz?
For a faster, more casual read, check HowManyOfMe.org — our sister site built around that single question.