Where does “buidech” come from?

buidech (Old Irish) comes from Old Irish buide, from Proto-Celtic bodiyā, from Proto-Celtic bodos, from Proto-Indo-European bʰed- — to improve, make better.

Ancestry of “buidech”, step by step

Step	Language	Word	Meaning
1	Old Irish	buide	yellow; yellowness; buttercup
2	Proto-Celtic	bodiyā	—
3	Proto-Celtic	bodos	good will
4	Proto-Indo-European	bʰed-	to improve, make better

Words derived from “buidech”

booiagh
buíoch
neuwooiagh
neamhbhuíoch

Every word from Proto-Indo-European bʰed- →Every word from Proto-Celtic bodos →Every word from Proto-Celtic bodiyā →