Thadeo is a very rare variant of Thad that has climbed to its highest level yet, peaking in 2025.
Thadeo is a boy name. In 2025 it ranked #4,129 for boy births in the United States (and #8,820 across all names), given to 26 babies. Thadeo was first reported in SSA data in 2014 and peaked in 2025 (26 births).
Boys named Thadeo per year · hover for count and boys rank · Source: U.S. Social Security Administration, national data 2014–2025 · U.S.+territories from SSA territory files (1998–2025) · SSA publishes a name only in years it was given to at least 5 babies, so a name may have been in use before — or between — the years shown here