In 2025, 54 US girls were named Alethea, making it the 3,030th most common girls’ name of the year, down 369 places from #2,661 in 2024. That is 11 fewer than the 65 girls named Alethea in 2024. Its best rank for girls was #522, reached in 1973. That year also had the most girls given the name: 322. For comparison, it was #3,772 in 2015 and #1,602 in 1950.
Social Security card records list Alethea in 127 years of the 146 from 1880 to 2025, starting in 1892 with 5 babies. In all, 4,968 US babies have been given the name, all of them girls. Its busiest decade was the 1970s, with 1,215 babies named Alethea.
Over the 10 years from 2016 to 2025, 574 US girls were named Alethea; the busiest of those years was 2021, with 81. In 2025 that was about 1 in 29,764 of the girls in SSA’s list for the year.
Related spellings in the SSA files include Aletha (6,948 babies since 1880). Rarer spellings such as Aletheia, Alithia and Alithea are summarised on this page.