Thadeo
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Meaning
a spelling of Tadeo, the Spanish form of Thaddeus
How popular is Thadeo around the world?
In the United States, 96 babies were named Thadeo between 2020 and 2025. In Argentina, 165 newborns were given the name Thadeo in 2024.
Thadeo is on the official records of the United States, Argentina, Montevideo, Chile, Austria and Mexico City.
United States
1 in 230,000
In the United States, 96 babies were named Thadeo between 2020 and 2025.
Shape drawn from US Social Security baby-name records. Thadeo has stayed rare in US records the whole time: no peak decade to name.
Births with a Social Security record. Source: U.S. Social Security Administration
Argentina
1 in 4,000
In Argentina, 165 newborns were given the name Thadeo in 2024.
share of that year’s name registrations
Given-name components of births in Argentina 2012–2024; national cells are lower bounds and no sex split is published. Source: RENAPER (Argentina), Dirección Nacional de Población, given names 2012-2024
Montevideo City
1 in 12,0002011
In Montevideo, 2 boys named Thadeo were born in 2011, spelling variants counted together.
The count never rose above 2 in a year, too few to chart.
Births in the department of Montevideo (not all of Uruguay) by first name and year of birth, 1940–2011, from the city’s civil registry, which writes names in capitals, almost always without accents; counted as spelling groups (accent and punctuation variants merged), nothing is withheld at source, and 2012 is excluded as a partial year. Source: Servicio de Registro Civil, Intendencia de Montevideo, Partidas de Registro Civil de Montevideo (Licencia de Datos Abiertos - Uruguay); 2012 dropped as partial
Chile
1 in 25,000
In Chile, 7 boys were registered as Thadeo in 2021, every accent spelling counted together.
The count never rose above 7 in a year, too few to chart.
First-name registrations with Chile’s civil registry by year of registration, 1920–2021, counted as spelling groups (Sofía, Sofia and Sofìa are one name, shown with its most-registered spelling); the registry withholds nothing, nametree keeps the groups that reached 5 registrations in some year, and shares divide by every registration of the year. Source: Servicio de Registro Civil e Identificación (Chile) via the guaguas package, first-name registrations 1920-2021
Austria
1 in 38,000
In Austria, 2 boys named Thadeo were born in 2025, ranked 1,241st among boys that year, spellings that differ only by special characters counted together.
The count never rose above 2 in a year, too few to chart.
Live births in Austria by year of birth, 1984–2025, from Statistik Austria’s first-name statistics; spellings that differ only by special characters are counted together (umlauts stay apart), every name down to a single birth is published, and the count covers babies with Austrian citizenship only until 2009, every baby from 2010, and from 2015 also births abroad to mothers living in Austria. Shares divide by Statistik Austria’s count of live births from 2010, and before that by the file’s own total for the year. Source: Statistik Austria - data.statistik.gv.at (OGDEXT_VORNAMEN_1, updated 2026-07-09)
Mexico City City
1 in 59,000
In Mexico City, there were 2 registrations of Thadeo in 2022.
share of that year’s registrations in the city
Civil-registry acts in Mexico City by registration year. Counts are lower bounds (names under 6 in a month and borough are removed at source) and count name-instances, not people; compound names are split, so “Maria Jose” counts under each part. 2023, a partial extract through 3 Mar with no cell on record for this name, is excluded. Source: Registro Civil of Mexico City, open data portal, registered given names 2000-2023
Not on the record in Spain, Puerto Rico, England and Wales, Canada, Ireland, New Zealand, Scotland and Poland: those registries withhold small counts, so rare uses may sit below their floors.
Not on the France record: nametree keeps spellings that reached 20 births in some year, so rarer uses are not shown. Not on the South Australia record for 1944 to 2017: that registry withholds nothing, so this spelling was not given there in those years. Not on Norway’s list: Statistics Norway lists only first names carried by 200 or more living people, so rarer names are not shown.
The Thadeo deep dive
Whether you’re naming a baby or exploring your own name’s history, this is a personal letter, not a list: where Thadeo truly comes from, how it traveled, and what a century of records reveals. If you have grown a tree on nametree, it also considers how Thadeo fits with your family’s names and surname.
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