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 |
|---|---|---|
| Bochan | 1 | 1458 (borch) |
| Bowchane | 1 | 1499 (arsbischop) |
| Buchan | 1 | 1479 (assover) |