A reliable meaning for Thadeo isn’t established in our sources yet. Rather than guess, we show what is recorded: how the name is used, how often, and the names it’s connected to.
The story
Published U.S. birth records include this spelling as early as 2014. This is the earliest published observation available here, rather than a date for the name’s origin.
From dated birth records
Thadeo through the years
Babies since 1880
126
126 boys · 0 girls
Most popular year
2025
26 babies
2025
26
#4,129 for boys
2021–25 vs 2016–20
+238%
Rising fast
Thadeo in U.S. Social Security birth records, 2014–2025, per million boys born. Years with fewer than five births for a sex are not published and appear as zero. Use the arrow keys to step through years.
Where it’s given
Most at home inTexas, California
FewerMore, relative to births Not published
2025 births by state of birth. Tiles are equal-sized so small states stay visible. Highest rates: Texas (7), California (5).
By the numbers
In 2025, this name appeared in 26 U.S. birth records for boys, ranking No. 4,129 among boys’ names. The recent annual counts are too incomplete to establish a ten-year comparison. In 2025, Texas had the largest reported state-level birth count for boys with this name (7).
From Social Security birth records and U.S. Census name counts for this exact spelling. Other spellings are counted separately.