Where does “amaeth” come from?

amaeth (Welsh) comes from Middle Welsh amaeth, from Proto-Brythonic *ammaɨθ, from Proto-Celtic ambaxtos, from Proto-Indo-European h₂eǵ- — to drive.

Ancestry of “amaeth”, step by step

Step	Language	Word	Meaning
1	Middle Welsh	amaeth	—
2	Proto-Brythonic	*ammaɨθ	—
3	Proto-Celtic	ambaxtos	servant
4	Proto-Indo-European	h₂eǵ-	to drive

amaeth — Etymology, Origin & Word History | Etymology Explorer