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 |
|---|---|---|
| Arthour | 3 | 1561 (bosting); 1567 (connotar); 1598 (connotar) |
| Arthure | 2 | 1491 (cognitioun); 1494 (compositioun) |
| Arthoure | 1 | 1473-4 (compositioun) |
| Arthur | 1 | 1443 (cose) |