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 |
|---|---|---|
| Lockard | 1 | 1627 (chalmerlane) |
| Lockhart | 1 | 1641 (conceat) |
| Lokart | 1 | 1570 (arrour) |
| Lokkert | 1 | 1489 (appropir) |