Popularity trend for the name Duncan in Aotearoa New Zealand, based on Department of Internal Affairs birth registrations.
Duncan reached its highest rank of #78 for boys in 1974. Duncan did not appear in the 2025 figures, which only list names given to at least 10 babies. Its popularity is falling compared with five years earlier. Duncan is used mainly for boys.
About this data: figures come from Department of Internal Affairs birth registrations for 1954-2025. The DIA only publishes a name for a given year when at least 10 babies were registered with it, so rarer names - and rarer spellings - are missing entirely, and a name can drop out of the record in quieter years. Spelling variants are counted separately, and counts reflect first names as registered.