In 2025, 2,995 US boys were named Callum, making it the 118th most common boys’ name of the year, up 40 places from #158 in 2024. That is 729 more than the 2,266 boys named Callum in 2024. Its best rank for boys was #118, reached in this year, 2025. That year also had the most boys given the name: 2,995. For comparison, it was #685 in 2015 and unranked in 1950.
Social Security card records list Callum in 43 years of the 146 from 1880 to 2025, starting in 1983 with 6 babies. In all, 16,089 US babies have been given the name, 0.2% of them girls and 99.7% boys. Its busiest decade was the 2020s, with 10,593 babies named Callum.
Over the 10 years from 2016 to 2025, 12,501 US boys were named Callum; the busiest of those years was 2025, with 2,995. In 2025 that was about 1 in 570 of the boys in SSA’s list for the year.
Among the states, Callum ranked highest in New Hampshire in 2025, at #38 for boys there. It was in the top 100 in 25 states (counting DC). Related spellings in the SSA files include Cal (7,868 babies since 1880), Calum (3,506 babies since 1880), Caelum (928 babies since 1880) and Kallum (697 babies since 1880). Rarer spellings such as Kalum, Calem and Caellum are summarised on this page.