Where does “s'” come from?
s' (Manx) comes from Old Irish ís, from Proto-Celtic ɸīssu, from Proto-Indo-European pedsú, from Proto-Indo-European pṓds, from Proto-Indo-European póds, from Proto-Indo-European ped- — to walk, to step; to stumble, to fall.
Ancestry of “s'”, step by step
| Step | Language | Word | Meaning |
|---|
| 1 | Old Irish | ís | under, below, beneath |
| 2 | Proto-Celtic | ɸīssu | under |
| 3 | Proto-Indo-European | pedsú | — |
| 4 | Proto-Indo-European | pṓds | foot |
| 5 | Proto-Indo-European | póds | — |
| 6 | Proto-Indo-European | ped- | to walk, to step; to stumble, to fall |