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 |
|---|---|---|
| Thomson | 3 | 1456 (concord); 1564 (athe); 1643 (birsie) |
| Thomsoune | 2 | 1591 (crave, crepill) |
| Tammisone | 1 | 1637 (bote) |
| Thomesoun | 1 | 1616 (credil) |
| Thomsone | 1 | 1505 (borowis) |
| Thomsoun | 1 | 1597 (cantrip) |