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 |
|---|---|---|
| Williamsone | 2 | 1473 (brigantine); 1625 (cutler) |
| Willamesone | 1 | 1527 (coact) |
| Willeamson | 1 | 1638-9 (ate brede) |
| Willeamsone | 1 | 1601 (cot-toun) |
| Williamsoun | 1 | 1610 (catour) |
| Wilȝamson | 1 | 1459 (breke) |