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 |
|---|---|---|
| Tweddaill | 1 | 1609 (commissar) |
| Tweddale | 1 | 1517 (cuntreth) |