In 2025, 190 US boys were named Duncan, making it the 1,124th most common boys’ name of the year, down 20 places from #1,104 in 2024. That is 5 fewer than the 195 boys named Duncan in 2024. Its best rank for boys was #378, reached in 1997. That year also had the most boys given the name: 644. For comparison, it was #790 in 2015 and #590 in 1950.
Social Security card records list Duncan in 145 years of the 146 from 1880 to 2025, starting in 1880 with 12 babies. In all, 21,230 US babies have been given the name, 0.1% of them girls and 99.9% boys. Its busiest decade was the 1990s, with 4,227 babies named Duncan.
Over the 10 years from 2016 to 2025, 2,292 US boys were named Duncan; the busiest of those years was 2016, with 286. In 2025 that was about 1 in 8,990 of the boys in SSA’s list for the year.
Among the states, Duncan ranked highest in Oregon in 2025, at #639 for boys there. It was not in the top 100 of any state. The open nickname list we use links it to Dunk.