Erin has been given to about 326,053 people in the United States since 1880. It was most common in 1983, which makes it a Gen X and millennial name.
Erin ranks 833rd among American girls in 2025, with 349 born that year. Its best year was 1983, when 15,050 babies were given the name, ranking 18th. The typical living American called Erin is about 41 years old today. It is relatively most common in Connecticut, where it accounts for 0.03% 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.