Thadeo
Boy name · #4130 in 2025 · Very rare
How old is the name Thadeo? In official American birth records, Thadeo has been tracked continuously since 2014, giving it 11 years of documented American history.
In 2025, 26 baby boys were named Thadeo, placing it at #4130 in the official national rankings. A decade ago it stood at #9568, so the name has been rising over the past ten years. Roughly one in every 69,231 boys born in 2025 was named Thadeo.
The 11-year story
Thadeo first appears in the Social Security records in 2014, when 5 boys received the name. Its all-time peak is essentially right now: 2025, with 26 babies and a rank of #4050. Names at their peak can keep climbing — or be one trend cycle from the long slide that eventually hits most popular names. Following the curve matters more than today's snapshot: a name's position on its rise-peak-decline arc is the best predictor of how common it will feel in a kindergarten class five years from now.
Babies named Thadeo per year. Source: Official national birth records.
Unlock the 5-year forecast and compare Thadeo against up to 5 other names.
Uniqueness: will there be another Thadeo in class?
On our rarity read — which blends how common Thadeo is today with its five-year momentum — the name reads as "very rare". A high score means genuine rarity — your Thadeo will likely be the only one in the room, with the occasional spelling-out as the price.
Where Thadeo is most common
State-level data for Thadeo is too sparse in 2025 to rank by rate — in most states its count falls below the SSA's per-state reporting threshold (counts under 5 are withheld).
Names like Thadeo
Statistically, parents drawn to Thadeo tend to be choosing among names with similar popularity arcs, era profiles, and sounds — the closest matches in our model are Mattheo, Amadeo, Jhayco, Kaido, and Truen.
MattheoAmadeoJhaycoKaidoTruenHarloTayoBento
Rank history (last 25 years)
| Year | Babies named Thadeo | Rank |
|---|---|---|
| 2025 | 26 | #4050 |
| 2024 | 20 | #4890 |
| 2023 | 19 | #5075 |
| 2022 | 12 | #6828 |
| 2021 | 11 | #7089 |
| 2020 | 8 | #8739 |
| 2019 | 12 | #6777 |
| 2016 | 6 | #10744 |
| 2015 | 7 | #9568 |
| 2014 | 5 | #12108 |
Frequently asked questions
How old is the name Thadeo?
In official American birth records, the name Thadeo first appeared in 2014 (over 11 years ago), when 5 newborn boys received the name. It has been tracked in modern national records for 11 years.
Is Thadeo a popular boy name?
Thadeo ranked #4130 among boys in 2025 with 26 babies given the name — outside the top 500, making it an uncommon pick. Ten years earlier it ranked #9568.
When was the name Thadeo most popular?
Thadeo peaked in 2025, when 26 American boys received the name (ranked #4050 that year). That peak is current — the name is at or near its all-time high right now.
How rare is the name Thadeo?
In 2025, roughly 1 in 69,231 newborn American boys was named Thadeo. On our rarity scale (rarity blended with momentum) we classify it as "very rare".
Data source: Official American birth records, 1880–2025, national and state files. Counts reflect registered birth records for American families.