In 2025, 177 US girls were named Jillian, making it the 1,266th most common girls’ name of the year, down 135 places from #1,131 in 2024. That is 37 fewer than the 214 girls named Jillian in 2024. Its best rank for girls was #96, reached in 1982. That year also had the most girls given the name: 3,056. For comparison, it was #440 in 2015 and #4,986 in 1950.
Social Security card records list Jillian in 80 years of the 146 from 1880 to 2025, starting in 1944 with 5 babies. In all, 83,424 US babies have been given the name, 99.7% of them girls and 0.3% boys. Its busiest decade was the 1980s, with 25,574 babies named Jillian.
Over the 10 years from 2016 to 2025, 3,220 US girls were named Jillian; the busiest of those years was 2016, with 602. In 2025 that was about 1 in 9,081 of the girls in SSA’s list for the year.
Among the states, Jillian ranked highest in Kansas in 2025, at #539 for girls there. It was not in the top 100 of any state. Related spellings in the SSA files include Gillian (16,127 babies since 1880). Rarer spellings such as Jilian, Jillianne and Jilliann are summarised on this page. The open nickname list we use links it to Jill.