Is Tiernan a boy or girl name?

Tiernan is mostly a boy’s name. Of the 1,676 Americans recorded with the name since 1880, 11.6% were girls and 88.4% were boys.

Name Legacy

Tiernan

Recorded 1985–2025 · United States

Tiernan was most popular in 2009, when 95 American babies were given the name — ranking #3,717 that year. In 2025 it ranked #8,077, with 29 births. Across 1880–2025 the Social Security Administration has recorded 1,676 people named Tiernan.

Tiernan over time

Births per year. The dot marks Tiernan’s peak in 2009. Gaps are years the SSA suppressed, which it does for any name given to fewer than five babies.

Is Tiernan a boy’s or a girl’s name?

Across the whole record Tiernan is mostly a boy’s name — 11.6% of the 1,676 Americans given it were girls and 88.4% were boys. In births since 2016 it is 5% girls and 95% 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 Tiernan

Where Tiernan is most concentrated

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

Explore further

See Tiernan on the interactive charts

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