The following information is taken from the Dictionary of the Older Scottish Tongue, available online at http://www.dsl.ac.uk/index.html. This is a work in progress.
| Spelling | Number | Dates & headers |
|---|---|---|
| Duncan | 14 | 1379 (baxter); 1443 (claym, cossing); 1485 (cost); 1489 (caudil); 1492 (comptrollar); 1505 (borowis); 1510 (calp); 1515 (cartill); 1516 (crounar); 1552 (assurance); 1574 (contumaxit); 1594-5 (crounar); 1619 (benok) |
| Duncane | 13 | 1448 (baillie); 1472 (dede); 1492 (cosing); 1499 (clem, cunsele); 1514 (crukit); 1526 (cirugian); 1536-7 (court-plaint); 1549 (athe); 1565 (bowhous); 1583 (college); 1615 (charge); 1629 (cottary) |
| Duncanus [1] | 2 | 1360 (clerk); 1438 (clarshach) |
[1] This was recorded in a Latin-language document.