In 2025, 52 US boys were named Cy, making it the 2,540th most common boys’ name of the year, down 189 places from #2,351 in 2024. That is 8 fewer than the 60 boys named Cy in 2024. Its best rank for boys was #1,037, reached in 1902. The most boys given the name in a single year was 117, in 2010. For comparison, it was #2,215 in 2015 and #1,710 in 1950.
Social Security card records list Cy in 112 years of the 146 from 1880 to 2025, starting in 1902 with 6 babies. In all, 3,921 US babies have been given the name, 0.6% of them girls and 99% boys. Its busiest decade was the 2000s, with 897 babies named Cy.
Over the 10 years from 2016 to 2025, 602 US boys were named Cy; the busiest of those years was 2023, with 75. In 2025 that was about 1 in 32,848 of the boys in SSA’s list for the year.
Among the states, Cy ranked highest in New York in 2025, at #1,004 for boys there. It was not in the top 100 of any state. Related spellings in the SSA files include Zya (1,301 babies since 1880). Rarer spellings such as Sy, Si and Sya are summarised on this page.