Recorded 1916–2023 · United States
Thaddius was most popular in 1989, when 18 American babies were given the name — ranking #7,669 that year. It was not recorded in 2025. Across 1880–2025 the Social Security Administration has recorded 593 people named Thaddius.
Across the whole record Thaddius is a boy’s name — 0.0% of the 593 Americans given it were girls and 100.0% were boys. In births since 2016 it is 0% girls and 100% boys.
Counted from every US birth the Social Security Administration recorded under this name, so it reflects use rather than opinion. A name given to fewer than five babies of one sex in a year is withheld at source and is not counted.
See Thaddius on the interactive charts
Source: U.S.A. Social Security Administration. Years 1880–2025. namelegacy.org