Boy · Name family
Thaddeus
45,212births recorded
13Countries
7Variants
1992Peak · Slovenia
#30Czechia 2025
Thaddeus is a boy name family recorded 45,212 times in 13 countries since 1880. It ranks highest today in Czechia (#30 in 2025). Its all-time peak was in Slovenia in 1992, at 1,090.6 births per 100,000. Elsewhere it is mostly given as Tadeusz (Poland, France, Ontario), Tadej (Slovenia), Tadeas (Czechia).
Popularity by country
Births per 100,000 newborns, all forms of the name combined.
Which form wins where
Births per 100,000 newborns for each form, in the selected country.
Rank in countries that publish top lists only
All forms of Thaddeus
| Variants | Language | Total births | Country | Latest rank | Peak year | 10-year trend |
|---|---|---|---|---|---|---|
| Thaddeus | English | 26,089 | 🇺🇸 United States | #797 | 1918 | ▼ 2 % |
| Thaddeus | English | 164 | 🏴 England & Wales | #1538 | 2025 | ▲ 161 % |
| Thaddeus | English | 70 | 🇨🇦 Ontario | #1517 | 2015 | new |
| Thaddeus | English | 54 | 🇨🇦 Alberta | #809 | 2017 | – |
| Thaddeus | English | 5 | 🇫🇷 France | – | 2018 | – |
| Tadeusz | Polish | 10,849 | 🇵🇱 Poland | #31 | 2025 | ▲ 305 % |
| Tadeusz | Polish | 840 | 🇫🇷 France | – | 1931 | – |
| Tadeusz | Polish | 423 | 🇺🇸 United States | – | 1917 | – |
| Tadeusz | Polish | 146 | 🏴 England & Wales | #1895 | 2019 | ▲ 166 % |
| Tadeusz | Polish | 126 | 🇨🇦 Ontario | – | 1955 | – |
| Tadeusz | Polish | 11 | 🇦🇺 South Australia | – | 1952 | – |
| Tadej | Slovene | 2,335 | 🇸🇮 Slovenia | #106 | 1992 | ▼ 38 % |
| Tadej | Slovene | 56 | 🇦🇹 Austria | #344 | 2025 | – |
| Tadej | Slovene | 24 | 🇨🇭 Switzerland | #799 | 2025 | – |
| Tadej | Slovene | 13 | 🇵🇱 Poland | #391 | 2025 | – |
| Tadej | Slovene | 6 | 🇺🇸 United States | #10695 | 2025 | – |
| Tadej | Slovene | 5 | 🇫🇷 France | – | 2024 | – |
| Tadeas | English | 1,670 | 🇨🇿 Czechia | #30 | 2011 | – |
| Tadeas | English | 6 | 🇺🇸 United States | – | 2016 | – |
| Tadeas | English | 5 | 🏴 England & Wales | – | 2012 | – |
| Thadeus | English | 1,123 | 🇺🇸 United States | #10695 | 1918 | ▼ 25 % |
| Thadeus | English | 30 | 🇫🇷 France | – | 1927 | – |
| Thadeus | English | 5 | 🇩🇪 Germany (large cities) | – | 2019 | – |
| Thaddaeus | English | 1,045 | 🇺🇸 United States | #7679 | 2001 | ▼ 30 % |
| Tadija | German | 66 | 🇦🇹 Austria | #344 | 2025 | – |
| Tadija | German | 26 | 🇨🇭 Switzerland | #882 | 2023 | – |
| Tadija | German | 15 | 🇫🇷 France | – | 2022 | – |
| Tadija | German | 5 | 🇸🇪 Sweden | – | 2024 | – |
How we grouped these names
- Thaddeus ↔ Tadej — Wikidata “said to be the same as”
- Thaddeus ↔ Tadeas — Wikidata “said to be the same as”
- Thaddeus ↔ Tadeusz — spelling variant
- Thaddeus ↔ Thadeus — spelling variant
- Thaddeus ↔ Thaddaeus — spelling variant
Questions about Thaddeus
How popular is the name Thaddeus?
In 2025 it ranked #30 in Czechia. Official registers record 45,212 births across 13 countries.
What is Thaddeus in other languages?
Tadeusz (Polish); Tadej (Slovene); Tadeas (English); Thadeus (English); Thaddaeus (English); Tadija (German).
When was Thaddeus most popular?
It peaked in Slovenia in 1992, at 1,090.6 births per 100,000.
Is Thaddeus a boy or a girl name?
In official birth registers, Thaddeus is a boy name.