Fewer than five US girls were named Kyrstin in 2025, so it does not appear in that year’s SSA list for girls. Its best rank for girls was #2,100, reached in 1991. The most girls given the name in a single year was 65, in 2003. For comparison, it was unranked (under five girls) in 2015 and unranked in 1950.
Social Security card records list Kyrstin in 34 years of the 146 from 1880 to 2025, starting in 1973 with 5 babies. In all, 1,274 US babies have been given the name, all of them girls. Its busiest decade was the 1990s, with 545 babies named Kyrstin.
Over the 10 years from 2016 to 2025, 5 US girls were named Kyrstin; the busiest of those years was 2016, with 5.
Related spellings in the SSA files include Kirsten (53,393 babies since 1880), Kirstin (8,778 babies since 1880), Kierstin (3,270 babies since 1880) and Kerstin (2,537 babies since 1880).