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 | Notes |
|---|---|---|---|
| Blak | 6 | 1475 (chalange); 1535-6 (correcting); 1548 (collaterale); 1597 (blak); 1602 (cadger); 1607-8 (coupar) | |
| Blac | 2 | 1337 (blak); 1356 (blak) | prepended |
| blak | 1 | 1448 (blak) | prepended |
| Blakk | 1 | 1490 (chaplan) |