Is Sydnei a boy or girl name?

Sydnei is a girl’s name. Of the 635 Americans recorded with the name since 1880, 100.0% were girls and 0.0% were boys.

Sydnei

Recorded 1988–2020 · United States

Sydnei was most popular in 2005, when 37 American babies were given the name — ranking #6,552 that year. It was not recorded in 2025. Across 1880–2025 the Social Security Administration has recorded 635 people named Sydnei.

Sydnei over time

Births per year. The dot marks Sydnei’s peak in 2005. Gaps are years the SSA suppressed, which it does for any name given to fewer than five babies.

Is Sydnei a boy’s or a girl’s name?

Across the whole record Sydnei is a girl’s name — 100.0% of the 635 Americans given it were girls and 0.0% were boys. In births since 2016 it is 100% girls and 0% 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 Sydnei

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See Sydnei on the interactive charts

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