Fewer than five US girls were named Katlynn in 2025, so it does not appear in that year’s SSA list for girls. Its best rank for girls was #802, reached in 1998. The most girls given the name in a single year was 268, in 1999. For comparison, it was #5,935 in 2015 and unranked in 1950.
Social Security card records list Katlynn in 38 years of the 146 from 1880 to 2025, starting in 1984 with 5 babies. In all, 3,975 US babies have been given the name, all of them girls. Its busiest decade was the 1990s, with 2,075 babies named Katlynn.
Over the 10 years from 2016 to 2025, 57 US girls were named Katlynn; the busiest of those years was 2018, with 13.
Related spellings in the SSA files include Kaitlyn (166,921 babies since 1880), Katlyn (18,438 babies since 1880), Kaitlynn (16,424 babies since 1880) and Katlin (5,461 babies since 1880).