Where does “eiste” come from?
eiste (Middle Irish) comes from Old Irish essi, from Old Irish a, from Proto-Celtic *ā, from Proto-Indo-European ō — oh, ah.
Ancestry of “eiste”, step by step
| Step | Language | Word | Meaning |
|---|
| 1 | Old Irish | essi | third-person singular feminine of as |
| 2 | Old Irish | a | nominative/accusative singular neuter of in; that... |
| 3 | Proto-Celtic | *ā | — |
| 4 | Proto-Indo-European | ō | oh, ah |