Is Cailin a boy or girl name?

Cailin is a girl’s name. Of the 3,743 Americans recorded with the name since 1880, 99.2% were girls and 0.8% were boys.

Cailin

Recorded 1968–2025 · United States

Cailin was most popular in 1998, when 169 American babies were given the name — ranking #1,969 that year. In 2025 it ranked #20,040, with 7 births. Across 1880–2025 the Social Security Administration has recorded 3,743 people named Cailin.

Cailin over time

Births per year. The dot marks Cailin’s peak in 1998. Gaps are years the SSA suppressed, which it does for any name given to fewer than five babies.

Is Cailin a boy’s or a girl’s name?

Across the whole record Cailin is a girl’s name — 99.2% of the 3,743 Americans given it were girls and 0.8% 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 Cailin

Where Cailin is most concentrated

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

Explore further

See Cailin on the interactive charts

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