In 2025, 29 US girls were named Marni, making it the 4,718th most common girls’ name of the year, up 5,284 places from #10,002 in 2024. That is 19 more than the 10 girls named Marni in 2024. Its best rank for girls was #625, reached in 1969. That year also had the most girls given the name: 253. For comparison, it was #8,283 in 2015 and #3,592 in 1950.
Social Security card records list Marni in 79 years of the 146 from 1880 to 2025, starting in 1946 with 11 babies. In all, 3,420 US babies have been given the name, 99.8% of them girls and 0.1% boys. Its busiest decade was the 1970s, with 1,320 babies named Marni.
Over the 10 years from 2016 to 2025, 175 US girls were named Marni; the busiest of those years was 2025, with 29. In 2025 that was about 1 in 55,423 of the girls in SSA’s list for the year.
Related spellings in the SSA files include Marnie (6,141 babies since 1880). The open nickname list we use links it to Marnie.