The following information is taken from the Dictionary of the Older Scots Tongue, available online at http://www.dsl.ac.uk/index.html. This is a work in progress.
| Spelling | Number | Dates & headers |
|---|---|---|
| Arthur | 2 | 1539 (cassok); 1591 (brewster) |
| Arthour | 1 | 1597 (casar) |