Lilly has been given to about 66,752 people in the United States since 1880. It was most common in 2010, which makes it a millennial-parent name.
Lilly ranks 252nd among American girls in 2025, with 1,218 born that year. Its best year was 2010, when 2,891 babies were given the name, ranking 106th. The typical living American called Lilly is about 16 years old today. It is relatively most common in North Dakota, where it accounts for 0.13% of births.
Source: US Social Security Administration, national and state name files, 2025 release, and the Office for National Statistics for England and Wales. Etymology researched and written by our editors. Living-population and median-age figures are our own estimates, described in the methodology.