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 |
|---|---|---|
| Robertsone | 4 | 1493 (cleuk); 1597-8 (bowar); 1598 (chirurgian); 1648 (brankis) |
| Robertsoun | 3 | 1585 (caget); 1589 (complice); 1612-3 (cordenar) |