Is Tilly a boy or girl name?

Tilly is a girl’s name. Of the 2,699 Americans recorded with the name since 1880, 100.0% were girls and 0.0% were boys.

Tilly

Recorded 1912–2025 · United States

Tilly was most popular in 2025, when 302 American babies were given the name — ranking #1,680 that year. In 2025 it ranked #1,680, with 302 births. Across 1880–2025 the Social Security Administration has recorded 2,699 people named Tilly.

Tilly over time

Births per year. The dot marks Tilly’s peak in 2025. Gaps are years the SSA suppressed, which it does for any name given to fewer than five babies.

Is Tilly a boy’s or a girl’s name?

Across the whole record Tilly is a girl’s name — 100.0% of the 2,699 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 Tilly

Where Tilly is most concentrated

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

Explore further

See Tilly on the interactive charts

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