Where does “lladdwyr” come from?

lladdwyr (Welsh) comes from Welsh lladd, from Proto-Brythonic llað, from Proto-Celtic sladyā, from Proto-Celtic sladyeti — to strike.

Ancestry of “lladdwyr”, step by step

lladdwyr traces back through two separate lines of ancestry.

via Welsh lladd

StepLanguageWordMeaning
1Welshlladdto kill, murder; to slaughter
2Proto-Brythonicllaðslaying, slaughter
3Proto-Celticsladyāstrike
4Proto-Celticsladyetito strike

via Welsh ŵyr

StepLanguageWordMeaning
1WelshŵyrSoft mutation of gŵyr; grandson, grandchild
2Middle WelshwyrSoft mutation of gwyr
Every word from Proto-Celtic sladyeti →Every word from Proto-Celtic sladyā →Every word from Proto-Brythonic llað →