Is Seiji a boy or girl name?

Seiji is a boy’s name. Of the 517 Americans recorded with the name since 1880, 0.0% were girls and 100.0% were boys.

Seiji

Recorded 1914–2025 · United States

Seiji was most popular in 2007, when 19 American babies were given the name — ranking #11,212 that year. In 2025 it ranked #18,449, with 8 births. Across 1880–2025 the Social Security Administration has recorded 517 people named Seiji.

Seiji over time

Births per year. The dot marks Seiji’s peak in 2007. Gaps are years the SSA suppressed, which it does for any name given to fewer than five babies.

Is Seiji a boy’s or a girl’s name?

Across the whole record Seiji is a boy’s name — 0.0% of the 517 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 Seiji

Explore further

See Seiji on the interactive charts

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