Is Rei a boy or girl name?

Rei is a unisex name. Of the 1,028 Americans recorded with the name since 1880, 53.5% were girls and 46.5% were boys. It changed hands in 2024, and has gone mainly to boys since.

Name Legacy

Rei

Recorded 1974–2025 · United States

Rei was most popular in 2019, when 67 American babies were given the name — ranking #4,582 that year. In 2025 it ranked #5,022, with 59 births. Across 1880–2025 the Social Security Administration has recorded 1,028 people named Rei.

Rei over time

Births per year. The dot marks Rei’s peak in 2019. Gaps are years the SSA suppressed, which it does for any name given to fewer than five babies.

Is Rei a boy’s or a girl’s name?

Across the whole record Rei is a unisex name — 53.5% of the 1,028 Americans given it were girls and 46.5% were boys. It changed hands: since 2024 it has gone mainly to boys, having gone mainly to girls before that. In births since 2016 it is 56% girls and 44% 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 Rei

Where Rei is most concentrated

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

California 7.6×

Explore further

See Rei on the interactive charts

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