The Duncan Surname Association (DSA) was founded in the early 1990s by W. A. "Wes" Duncan (1930-2003). The purpose was to collect and make available documented information about all Duncans (including several variant spellings of Duncan) who lived in the United States prior to 1850. Some sources (such as past newsletters) are free; other access requires paid membership in the association. It appears this site was last updated in Fall 2004 (date of last newsletter).