Is Thadius a boy or girl name?

Thadius is a boy’s name. Of the 511 Americans recorded with the name since 1880, 0.0% were girls and 100.0% were boys.

Thadius

Recorded 1922–2024 · United States

Thadius was most popular in 1974, when 19 American babies were given the name — ranking #5,333 that year. It was not recorded in 2025. Across 1880–2025 the Social Security Administration has recorded 511 people named Thadius.

Thadius over time

Births per year. The dot marks Thadius’s peak in 1974. Gaps are years the SSA suppressed, which it does for any name given to fewer than five babies.

Is Thadius a boy’s or a girl’s name?

Across the whole record Thadius is a boy’s name — 0.0% of the 511 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.

Names that peaked alongside Thadius

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See Thadius on the interactive charts

Source: U.S.A. Social Security Administration. Years 1880–2025. namelegacy.org