Where does “trebus” come from?

trebus (Old Irish) comes from Old French trebus, from Late Latin tubrucus, from Proto-Germanic *þeuhabrōks, from Proto-Indo-European bʰrēǵ- — to shine, shimmer.

Ancestry of “trebus”, step by step

Step	Language	Word	Meaning
1	Old French	trebus	—
2	Late Latin	tubrucus	—
3	Proto-Germanic	*þeuhabrōks	—
4	Proto-Indo-European	bʰrēǵ-	to shine, shimmer

Every word from Proto-Indo-European bʰrēǵ- →

trebus — Etymology, Origin & Word History | Etymology Explorer