Is Casimer a boy or girl name?

Casimer is a boy’s name. Of the 1,895 Americans recorded with the name since 1880, 0.0% were girls and 100.0% were boys.

Name Legacy

Casimer

Recorded 1895–2017 · United States

Casimer was most popular in 1918, when 135 American babies were given the name — ranking #1,112 that year. It was not recorded in 2025. Across 1880–2025 the Social Security Administration has recorded 1,895 people named Casimer.

Casimer over time

Births per year. The dot marks Casimer’s peak in 1918. Gaps are years the SSA suppressed, which it does for any name given to fewer than five babies.

Is Casimer a boy’s or a girl’s name?

Across the whole record Casimer is a boy’s name — 0.0% of the 1,895 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 Casimer

Where Casimer is most concentrated

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

Explore further

See Casimer on the interactive charts

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