Tadeusz
given name · Polish · Latin script
Recorded as a male name· opposite-gender records fall within measured source noise
Tadeusz is a given name, with more bearers in Poland than in any other country, where it is the 57th most common given name. It appears chiefly in Polish and English, written in the Latin script. Recorded meaning: a male given name, equivalent to English Thaddaeus.
- PLPoland1 in 165◐
- CZCzechia1 in 58K
- GBUnited Kingdom1 in 109K
carrying the name, one hue, darker where it is more common. Hover a country for its figure.
- ≈237K ●
- 2 ●
- Sources
- 181 ●
- 1 in 165 ◐
across 12 countries
recorded for this name
37K records
Official registry-verified
Poland
Spellings & scripts●
Locally spelled Тадеуш in RU Russia, BG Bulgaria.
Spellings marked ● are how people bearing the name write it in our records; ○ marks a model's transliteration. Click a spelling to open its page.
Meaning & origin●
a male given name, equivalent to English Thaddaeus
Sources 1
- kaikki.org Wiktionary extract (IPA + transliterations)
Attested across 11 languages in the etymology graph.
Where in the world●
Sorted by bearers counted by national registers, records where none counts.
| Country | Most common spelling | Sources | |||||
|---|---|---|---|---|---|---|---|
| PL Poland | #57 | 232,095△ | 16K rec. | 1 in 165 | 232K | Tadeusz | 166 |
| US United States | — | 2,693 | 18K rec. | 1 in 124K | 2.7K | Tadeusz | 181 |
| GB United Kingdom | — | 1,903 | 1.3K rec. | — | listed | Tadeusz | 74 |
| SE Sweden | — | 796△ | 36 rec. | 1 in 13K | 796 | — | 19 |
| CA Canada | — | 362 | 319 rec. | — | — | Tadeusz | 51 |
| NO Norway | — | 281 | 141 rec. | 1 in 19K | 846 | Tadeusz | 15 |
| BR Brazil | — | 206△ | 13 rec. | 1 in 1M | 229 | — | 2 |
| CZ Czechia | — | 186△ | 37 rec. | 1 in 58K | 186 | Tadeusz | 24 |
| SK Slovakia | — | 175 | 8 rec. | — | — | Tadeusz | 14 |
| IS Iceland | — | 159 | — | 1 in 2.2K | 159 | — | — |
| NL Netherlands | — | 141 | 161 rec. | 1 in 123K | 141 | Tadeusz | 18 |
| IT Italy | — | 141 | 134 rec. | — | listed | Tadeusz | 16 |
Roughly 232K people in Poland bear this name (about 1 in 165). Estimates project the name's share of our records onto national population, so each is only as good as the record base beside it — the Basis column gives that base; rows marked △ rest on fewer records than the estimate itself and are order-of-magnitude at best.
Country figures for a list of names, at full precision, are available under licence rather than by scraping this table. How that works.
Languages●
- Polish1.2M97%
- English17K1%
- French5.3K1%
- German3.2K1%
- Spanish1.6K1%
Show as table
| Name | Records | Note |
|---|---|---|
| Polish | 1,203,877 | 97% |
| English | 17,429 | 1% |
| French | 5,311 | 1% |
| German | 3,232 | 1% |
| Spanish | 1,642 | 1% |
Language is read off each record's context, not declared by the bearer; a share is of all records for this spelling.
Other recorded senses●
Tadeusz is also recorded in 2 other lexicons, as a different name or as an ordinary word. These are senses of the spelling, not of the name above.
In Polish, Thaddeus
as a namePolish Personal Names (CIA Foreign Names Studies, ch. 24)
Polish form of THADDEUS .
as a word
Ordered by how much of this spelling's record each language holds, so a sense from a language the name is barely used in sits last rather than first.
Over time●
Show as table
| Year | records |
|---|---|
| 1912 | 5 |
| 1913 | 5 |
| 1914 | 5 |
| 1915 | 14 |
| 1916 | 10 |
| 1917 | 26 |
| 1918 | 19 |
| 1919 | 17 |
| 1920 | 17 |
| 1921 | 12 |
| 1922 | 12 |
| 1923 | 15 |
| 1924 | 8 |
| 1925 | 15 |
| 1926 | 6 |
| 1927 | 10 |
| 1930 | 6 |
| 1954 | 6 |
| 1955 | 5 |
| 1957 | 8 |
| 1959 | 5 |
| 1962 | 10 |
| 1964 | 7 |
| 1967 | 11 |
| 1969 | 7 |
| 1970 | 8 |
| 1973 | 9 |
| 1975 | 5 |
| 1980 | 5 |
| 1981 | 5 |
| 1982 | 8 |
| 1984 | 5 |
| 1985 | 5 |
| 1987 | 5 |
| 1990 | 6 |
| 1996 | 7 |
| 1998 | 5 |
| 2000 | 6 |
| 2003 | 6 |
| 2010 | 5 |
| 2012 | 5 |
| 2014 | 8 |
| 2015 | 5 |
| 2017 | 7 |
| 2019 | 7 |
| 2020 | 8 |
| 2021 | 5 |
| 2022 | 13 |
| 2023 | 9 |
| 2024 | 5 |
US SSA — National Baby Names (1880–present) — 50 years between 1912–2024. One register's own figures, never a sum across registers: two registers counting the same people would double them.
Notable people with this name●
- Tadeusz Kościuszkob. 1746CHPolish, Lithuanian and American military leader (1746–1817)
- Tadeusz Boy-Żeleńskib. 1874PLPolish writer and translator (1874–1941)
- Tadeusz Kotarbińskib. 1886PLPolish philosopher (1886–1981)
- Tadeus Reichsteinb. 1897CHnot in their usual namePolish-Swiss chemist (1897-1996)
- Tadeusz Różewiczb. 1921PLPolish poet, dramatist and writer
- Tadeusz Borowskib. 1922UAPolish writer and journalist (1922-1951)
- Tadeusz Konwickib. 1926PLPolish writer and film director (1926–2015)
- Tadeusz Mazowieckib. 1927PLPolish politician and prime minister (1927-2013)
- Jan Komasab. 1981PLnot in their usual namePolish film director and screenwriter
- Karol Nawrockib. 1983PLnot in their usual namePolish politician and historian, President of the Republic of Poland since 2025
The ten people covered by the most Wikipedia language editions — a proxy for cross-cultural notability, which favours historical and Western figures over equally prominent contemporary ones — shown by birth year. Source: Wikidata (CC0).
Evidence●
Attested in 45 sources across 21 countries.
Reference works 4
- Dictionary of American Family Names
- Wikipedia given-name tokens
- Wikipedia surname tokens
- Wikidata name items (native-script + romanized given/family names)
These works list the name; their figures are licensed and are not reproduced here.
Register rows as of the 2026-09-12 data build · 318 rows in the corpus for this spelling.
Frequently asked questions
- How common is the name Tadeusz?
- We estimate roughly 237 thousand people bear Tadeusz (counting its spellings and scripts) across 12 countries in our records.
- In which country does Tadeusz have the most bearers?
- We estimate about 232 thousand people bear Tadeusz in Poland, more than in any other country in our records, where it is most often spelled tadeusz.
- Where is Tadeusz most common?
- Tadeusz is densest in Poland, where the national register counts about 1 in 165 people carrying it.
- How common is Tadeusz compared with other names?
- In Poland, Tadeusz is the 57th most common given name of 66,904 given names recorded there.
- Is Tadeusz a male or female name?
- Tadeusz is a male name in our records. Opposite-gender entries fall within the cross-gender noise we measure in the source data, so we don't report them as usage.
- What does the name Tadeusz mean?
- Recorded meaning: a male given name, equivalent to English Thaddaeus
Query this name via API
curl https://api.mondonomo.ai/api/v1/name-graph/tadeuszThe same payload this page is built from: spellings and scripts, countries and languages, related names, and the registers that attest the form. Rate-limited for casual use. Bulk access and licensing.
About this data
Data snapshot . Figures are rebuilt periodically and will change.
Statistics are aggregated from the Mondonomo name corpus; related names and etymology are inferred from the name graph; pronunciation and any machine-marked transliterations are model-generated. Read how the numbers are made, including their known failure modes, and where the data comes from.
Reference works we consult — surname dictionaries, official name registers, Wikidata and Wiktionary — are named directly, beside the claims they support. The per-country source counts also include datasets of person records: we publish how many there are and their authority tier, but not their names.
Cite this page Mondonomo, “Tadeusz” — the 57th most common given name in Poland. Data snapshot 2026-09-12.