| 1 | Manx | mee-chiart | improper, wrong; erroneous, erring; inequitable,... |
| 2 | Manx | kiart | right, correct; true; exact, accurate, precise,... |
| 3 | Old Irish | cert | correct, right, proper, fitting; fair, just;... |
| 4 | Latin | certus | certain; fixed, settled, firm; resolved,... |
| 5 | Proto-Indo-European | krey- | to sift, separate, divide |