| 1 | Old Irish | ess- | ex-, out; privative prefix: non-, -less |
| 2 | Old Irish | léicid | to leave, abandon, release, let go; to let,... |
| 3 | Proto-Celtic | linkʷīti | to leave, to leave behind |
| 4 | Proto-Indo-European | linékʷti | to be leaving |
| 5 | Proto-Indo-European | leykʷ- | to leave |