In 2025, 48 US girls were named Unknown, making it the 3,293rd most common girls’ name of the year, up 663 places from #3,956 in 2024. That is 10 more than the 38 girls named Unknown in 2024. Its best rank for girls was #330, reached in 1952. The most girls given the name in a single year was 644, in 1954. For comparison, it was #3,647 in 2015 and #348 in 1950.
In 2025, 47 US boys were named Unknown, making it the 2,757th most common boys’ name of the year, up 196 places from #2,953 in 2024. That is 4 more than the 43 boys named Unknown in 2024. Its best rank for boys was #308, reached in 1954. That year also had the most boys given the name: 548. For comparison, it was #2,251 in 2015 and #336 in 1950.
Social Security card records list Unknown in 145 years of the 146 from 1880 to 2025, starting in 1880 with 5 babies. In all, 19,714 US babies have been given the name, 50% of them girls and 50% boys. Its busiest decade was the 1950s, with 8,929 babies named Unknown.
Over the 10 years from 2016 to 2025, 478 US girls were named Unknown; the busiest of those years was 2018, with 66. In 2025 that was about 1 in 33,485 of the girls in SSA’s list for the year.