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 |
|---|---|---|
| Dumber | 3 | 1570 (chalmerlane, corshous, currok) |
| Dumbar | 2 | 1583 (cautionarschip); 1641 (cloud) |
| Dunbar | 2 | 1538 (awing); 1598 (cotar) |
| of Dunbar | 2 | 1479 (constitutioun); 1498 (avouch) |