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 |
|---|---|---|
| Dowglas | 13 | 1455 (anherdance); 1492 (coursable); 1496 (chanceler); 1508 (comptrollar); 1544 (cousing); 1545 (credit); 1561 (cullour-du-roy); 1568 (boucheour); 1575 (barne); 1578 (brother); 1580 (complice); 1611 (caschet); 1626 (blude) |
| Douglas | 9 | 1494-5 (bredehous); 1495 (basin-silver); 1498 (compositioun); 1503 (bredehous); 1540 (auchtand); 1542 (bastardry); 1583 (bakebrede, coy); 1647 (bid) |
| of Douglas | 5 | 1409 (bind); 1412 (cosing); 1448 (blak, day); 1494 (berising) |
| Dowgles | 2 | 1546 (almery, comptar) |
| Dowglace | 1 | 1543 (abusive) |
| of Dowglas | 1 | 1489 (basin) |
| of Dowglass | 1 | 1489 (basin-silver) |