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 |
|---|---|---|
| Barclay | 5 | 1544 (companȝeon); 1560 (awing); 1585 (clos); 1588 (apothecar); 1611 (damisel) |
| Barklay | 3 | 1478 (curatry); 1598-9 (carfully); 1599 (commissioun) |
| Barcla | 2 | 1481 (actor, charter) |
| Berclay | 2 | 1437 (dam) |
| Barclaye | 1 | 1601-2 (banket) |