In 2025, 109 US girls were named Marlo, making it the 1,839th most common girls’ name of the year, down 126 places from #1,713 in 2024. That is 10 fewer than the 119 girls named Marlo in 2024. Its best rank for girls was #396, reached in 1968. The most girls given the name in a single year was 593, in 1970. For comparison, it was #2,397 in 2015 and #5,084 in 1950.
In 2025, 95 US boys were named Marlo, making it the 1,720th most common boys’ name of the year, down 40 places from #1,680 in 2024. That is 5 fewer than the 100 boys named Marlo in 2024. Its best rank for boys was #882, reached in 1972. The most boys given the name in a single year was 106, in 2023. For comparison, it was #2,630 in 2015 and #1,924 in 1950.
Social Security card records list Marlo in 108 years of the 146 from 1880 to 2025, starting in 1915 with 7 babies. In all, 10,944 US babies have been given the name, 66% of them girls and 34% boys. Its busiest decade was the 1970s, with 3,201 babies named Marlo.
Over the 10 years from 2016 to 2025, 1,018 US girls were named Marlo; the busiest of those years was 2022, with 122. In 2025 that was about 1 in 14,746 of the girls in SSA’s list for the year.
Among the states, Marlo ranked highest in Michigan in 2025, at #927 for girls there. It was not in the top 100 of any state. Related spellings in the SSA files include Mario (152,403 babies since 1880) and Marlon (31,292 babies since 1880). Rarer spellings such as Marloe and Marlou are summarised on this page.