Where does “amaethu” come from?

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

Ancestry of “amaethu”, step by step

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

Every word from Proto-Indo-European h₂eǵ- →

amaethu — Etymology, Origin & Word History | Etymology Explorer