Thaddeus
Meaning: not confirmed (origin debated)
About the name Thaddeus
The origin of Thaddeus is debated, and we couldn't confirm its meaning from a sourced etymology. A commonly cited theory links it to Aramaic roots, with the meaning âHeart, courageousâ. Treat that as a theory, not a settled fact.
Why we say this: we only state a meaning as fact when a sourced etymology (Wiktionary, with its references) supports it. For Thaddeus we didn't find one we were confident in, so we show the popular explanation as a theory.
It has a unique feel. In 2025, Thaddeus ranked #798 for boys in the US, with 314 babies given the name. Its peak year since 1940 was 2016. Since 2000, 100% of US babies named Thaddeus were boys.
- US rank 2025
- #798
- In 2015
- #705
- Babies in 2025
- 314
Popularity of Thaddeus, 1940â2025
Latest SSA data: 2025.
Popularity data: U.S. Social Security Administration national baby names (public domain; names given to at least 5 babies of one sex per year).
Nicknames for Thaddeus
- Thad
Names similar to Thaddeus
Name meanings marked or linked âWiktionaryâ are adapted from Wiktionary by Wiktionary contributors, CC BY-SA 4.0; each name page links its source entry.