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 |
|---|---|---|
| Forestar | 2 | 1518 (culrach); 1541 (bowar) |
| Forster | 2 | 1492 (comptrollar); 1526 (assithment) |
| Forestare | 1 | 1541 (arrow) |
| Forester | 1 | 1457 (chawmerlane) |
| Forrester | 1 | 1612 (commissar) |
| Forstar | 1 | 1489 (caudil) |