Where does “ois” come from?
ois (Old Welsh) comes from Proto-Brythonic oɨs, from Proto-Celtic aiwestom, from Proto-Indo-European h₂ey- — vital force, life, age, eternity; day, morning.
Ancestry of “ois”, step by step
| Step | Language | Word | Meaning |
|---|
| 1 | Proto-Brythonic | oɨs | age |
| 2 | Proto-Celtic | aiwestom | age; lifetime; era |
| 3 | Proto-Indo-European | h₂ey- | vital force, life, age, eternity; day, morning |