Where does “ab” come from?
ab (Old Irish) comes from Proto-Celtic abū, from Proto-Indo-European h₂ep- — water, body of water.
Ancestry of “ab”, step by step
| Step | Language | Word | Meaning |
|---|
| 1 | Proto-Celtic | abū | river |
| 2 | Proto-Indo-European | h₂ep- | water, body of water |