- A male given name; the name of two early saints and of two kings of Scotland.
- c. 1606, William Shakespeare, “The Tragedie of Macbeth”, in Mr. William Shakespeares Comedies, Histories, & Tragedies: Published According to the True Originall Copies (First Folio), London: Printed by Isaac Iaggard, and Ed[ward] Blount, published 1623, OCLC 606515358, [Act III, scene i]:
- For them the gracious Duncan I have murder'd
- 2011 Sophie Hannah, Lasting Damage, Hodder & Stoughton, →ISBN, pages 77-78:
- His full name is Benji Duncan Geoffrey Rigby-Monk. 'You're joking,' Kit said, when I first told him. 'Benji? Not even Benjamin?' Duncan and Geoffrey are his two granddads'names ― both unglamorous and old-dufferish, in Kit's view, and not worth inflicting on a new generation ― and Rigby-Monk is a fusion of Fran's surname and Anton's.
- A surname.
- Several places in the U.S.A. and one in Canada.