Duncan is a distinctive boys' name in United States, ranking #918 in 2022 with 252 recorded births. This places Duncan in the top 6% of ranked US boys' names for the year. Its actual usage is classified as Uncommon. The name reached its all-time peak in 1997 with 644 births ranking #378. Since 1996, the popularity has decreased by 50.1%. In 2022, approximately 1 in every 6,922 boys born was named Duncan. FALLING Recent data shows the name is currently falling.