Fewer than five US girls were named Erinn in 2025, so it does not appear in that year’s SSA list for girls. Its best rank for girls was #1,090, reached in 1977. The most girls given the name in a single year was 156, in 1990. For comparison, it was #7,744 in 2015 and unranked in 1950.
Social Security card records list Erinn in 57 years of the 146 from 1880 to 2025, starting in 1963 with 5 babies. In all, 3,561 US babies have been given the name, 96% of them girls and 4.0% boys. Its busiest decade was the 1980s, with 1,090 babies named Erinn.
Over the 10 years from 2016 to 2025, 62 US girls were named Erinn; the busiest of those years was 2017, with 16.
Related spellings in the SSA files include Erin (326,053 babies since 1880), Eryn (7,588 babies since 1880), Eren (2,440 babies since 1880) and Erynn (1,853 babies since 1880). Rarer spellings such as Erienne, Erianne and Erionne are summarised on this page.