In 2025, 17 US girls were named Cailynn, making it the 6,588th most common girls’ name of the year, down 1,543 places from #5,045 in 2024. That is 9 fewer than the 26 girls named Cailynn in 2024. Its best rank for girls was #2,635, reached in 2013. The most girls given the name in a single year was 68, in 2009. For comparison, it was #2,970 in 2015 and unranked in 1950.
Social Security card records list Cailynn in 35 years of the 146 from 1880 to 2025, starting in 1990 with 5 babies. In all, 1,183 US babies have been given the name, all of them girls. Its busiest decade was the 2010s, with 529 babies named Cailynn.
Over the 10 years from 2016 to 2025, 304 US girls were named Cailynn; the busiest of those years was 2016, with 52. In 2025 that was about 1 in 94,545 of the girls in SSA’s list for the year.
Related spellings in the SSA files include Kailyn (14,351 babies since 1880), Kaylynn (12,257 babies since 1880), Cailyn (5,554 babies since 1880) and Kaelynn (5,052 babies since 1880).