| 1 | Old Dutch | io | always, every time, continuously; ever, at some... |
| 2 | Proto-West Germanic | aiw | long time, age, eternity; law |
| 3 | Proto-Germanic | aiwaz | long time, age, eternity |
| 4 | Proto-Indo-European | h₂eyu- | vitality; eternal; vital force, life, long life,... |
| 5 | Proto-Indo-European | h₂ey- | vital force, life, age, eternity; day, morning |