Is Theodor a boy or girl name?

Theodor is a boy’s name. Of the 2,216 Americans recorded with the name since 1880, 0.0% were girls and 100.0% were boys.

Name Legacy

Theodor

Recorded 1884–2025 · United States

Theodor was most popular in 2022, when 88 American babies were given the name — ranking #3,892 that year. In 2025 it ranked #4,257, with 76 births. Across 1880–2025 the Social Security Administration has recorded 2,216 people named Theodor.

Theodor over time

Births per year. The dot marks Theodor’s peak in 2022. Gaps are years the SSA suppressed, which it does for any name given to fewer than five babies.

Is Theodor a boy’s or a girl’s name?

Across the whole record Theodor is a boy’s name — 0.0% of the 2,216 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 Theodor

Where Theodor is most concentrated

How much more common the name is in each state than across the country as a whole.

Explore further

See Theodor on the interactive charts

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