In 2025, 817 US boys were named Kieran, making it the 389th most common boys’ name of the year, up 51 places from #440 in 2024. That is 101 more than the 716 boys named Kieran in 2024. Its best rank for boys was #389, reached in this year, 2025. That year also had the most boys given the name: 817. For comparison, it was #512 in 2015 and #1,784 in 1950.
Social Security card records list Kieran in 99 years of the 146 from 1880 to 2025, starting in 1918 with 8 babies. In all, 19,218 US babies have been given the name, 8.4% of them girls and 92% boys. Its busiest decade was the 2010s, with 5,623 babies named Kieran.
Over the 10 years from 2016 to 2025, 6,213 US boys were named Kieran; the busiest of those years was 2025, with 817. In 2025 that was about 1 in 2,091 of the boys in SSA’s list for the year.
Among the states, Kieran ranked highest in South Dakota in 2025, at #211 for boys there. It was not in the top 100 of any state. Related spellings in the SSA files include Ciaran (2,233 babies since 1880), Kiran (5,041 babies since 1880), Keren (5,014 babies since 1880) and Kyran (3,282 babies since 1880). Rarer spellings such as Kerin, Keron and Kirin are summarised on this page.