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Tadeusz

Boys' name

Form of Thaddeus

Tadeusz has been given to 423 babies in the U.S. since 1912. It was used fewer than 5 times in 2025, so it doesn't appear in the latest year's list — today it's a genuinely uncommon pick. Its peak year was 1917, with 26 recorded.

Babies named Tadeusz, 2024

1 in 669,000

Tadeusz over time, 1880–2025

Boys
010203018801900192019401960198020002020

Based on births in the U.S. Babies given the name each year. Hover the chart — or focus it and use the arrow keys — for any year. Gaps mean the name was given fewer than 5 times that year; these counts are unpublished.

Tadeusz: meaning, origin, and history

Form of Thaddeus

Deeper origin not confirmed in the cited records

What Tadeusz means

Tadeusz is a form of Thaddeus.

Documented naming usage and pronunciation

Tadeusz is used in Polish.

Another recorded pronunciation is /ta.ˈdɛ.uʂ/ for Tadeusz.

Meaning behind the documented name family

The name developed through Tadeusz → Thaddeus. The family’s proposed meaning is “heart, breast”, recorded in the naming reference for Thaddeus.

Origin, language, and formation

Tadeusz comes through Latin Thaddaeus, Ancient Greek Θαδδαῖος and Biblical Hebrew תַדַּי.

Related names and everyday forms

Related names include Thaddeus and Thaddaeus.

Pronunciation and spelling

In Polish, Tadeusz is pronounced /taˈdɛ.uʂ/.

American usage and historical context

In the United States, 423 boys were recorded with the name Tadeusz between 1912 and 2024. Its highest annual count was 26 in 1917; its best national rank was #1,388 in 1917.

Sources & methodologyReferences, data & attribution

Meaning, origin, and language notes draw on the references below.

American popularity figures use published Social Security Administration records for this exact spelling. Counts below five for a name, sex, and year are omitted.

Wiktionary material is available under CC BY-SA 4.0.

How common is Tadeusz?

Tadeusz had fewer than 5 recorded uses in 2025, so these figures use 2024, the last year it was published.

Among all babies, 2024
1 in 669,000
5 of 3,342,801 births
Among boys only
1 in 345,000
<0.01% of boys
Rank, 2024
Unranked
Fewer than 5 uses
Coin-flip room size
463,412 kids
Even odds of a second one

Where Tadeusz sits on the popularity scale

Rarest published (5 a year)#1 — Liam (20,818)

Chance at least one other child shares the name

If the other children were drawn at random from the 2024 national name distribution. Real classrooms cluster by region and community, so treat these as a floor, not a ceiling.

Class of 20Under 1%
Class of 30Under 1%
Grade of 100Under 1%
School of 500Under 1%

Put another way: gather 463,412 children born in 2024 and it's an even bet that one of them is another Tadeusz. In a class of 30 the chance is Under 1%.

When Tadeuszs were born

Half of everyone ever recorded as Tadeusz was born before 1955 — so the typical Tadeusz is around 70 today.

Median birth year
1955
About 70 years old
Biggest decade
1910s
23.9% of all use
Born in the last 25 years
21.0%
Spread across generations
Recorded since 1950
221
People you could plausibly meet
Choose a decade

1910s — 23.9% of all recorded uses (101).

Is Tadeusz rising or falling?

Rank movement and count movement can disagree — the number of distinct names in use keeps growing, so a name holding a steady count still slides down the list. Both are shown.

Rank vs 1 year ago
—
Not ranked then
Rank vs 5 years ago
New entry
Not ranked then
Rank vs 10 years ago
—
Not ranked then
Births vs 10 years ago
—
Not published both years
Share of its own peak
0%
Peak was 1917 (26)
Years since peak
108
Years
Year-to-year steadiness
Volatile
48.1% average annual change
Best rank ever
#1,388
1917

Spellings of Tadeusz

Tadeusz is not the most common spelling — Mateusz is, with 42.8% against Tadeusz's 15.7%.

Grouped by closeness of spelling (up to two letter changes), same sex, with a floor on all-time use. It catches Sophia/Sofia and Aiden/Ayden, and misses spellings that sound alike but look different, like Sean and Shawn.

Where Tadeusz is used

Across 1910–2025, Tadeusz was most concentrated in Massachusetts — about 1 in — boys, against 1 in 765,377 across all states with data. It was least common in Ohio (1 in —).

00 per 100,000

Most concentrated

  1. 1Massachusetts1 in —
  2. 2Ohio1 in —

Shading is the share of that state's recorded boys given this name, not the raw count — otherwise the map would just show which states are biggest. Unshaded states have no published records for this period. U.S. birth records suppress state-year counts below 5; state counts therefore don't add up to the national total. Every state links to its full rankings. Tadeusz has too little recent state data to map, so this covers all years from 1910.

Tadeusz around the world

Where Tadeusz ranks in official birth records elsewhere in the world. Rankings only — the number of births isn’t comparable between places, so it isn’t shown.

  • England & Wales
    2005–2025
    #1,897
    in 2025
  • Ireland
    2010–2020
    #741
    in 2020
  • France
    1922–2007
    #5,231
    in 2007
  • Norway
    1880–1984
    #603
    in 1984
  • South Australia
    1945–1974
    #455
    in 1974

Popularity data from Office for National Statistics, Central Statistics Office, Institut national de la statistique et des études économiques, Statistics Norway and Consumer and Business Services (South Australia). ONS data under Open Government Licence v3.0. CSO, SSB, CBS SA data under CC BY 4.0. INSEE data under Licence Ouverte / Etalab 2.0.

Tadeusz by the numbers

The raw record for each sex the name is used for.

As a boy's name

Rank in 2025
Unranked
Trend vs 5 yrs ago
—
Best rank ever
#1,388
1917
Peak year
1917
26 that year
First recorded
1912
Last recorded
2024
All-time count
423
Count in 2025
Under 5

Names similar to Tadeusz

Matched on shared beginnings and endings, similar length, and comparable popularity.

TadashiTadariusTadenTadhgMateuszTadaoTadrianDariuszTadanTadeoMariuszTadeiTadeusTadarriusTaddTaddeoTadeyTadehTadejTadTadghTadeTadeasTadayoshi

Sibling names for Tadeusz

Names from the same era and popularity tier — the two things that make a sibling set feel deliberate — skipping lookalike spellings and shared initials.

Explore around Tadeusz

Top names of 1917, Tadeusz's peak yearThe 1910s in fullOther names that peaked in 1917Boys' names starting with TPolish Boy Names