Where does “boo” come from?

boo (Galician) comes from Old Portuguese bõo, from Latin bonus, from Old Latin duenos, from Proto-Italic dwenos, from Proto-Indo-European dew- — to show favour, revere; to fail, to lag, to be...

Ancestry of “boo”, step by step

Step	Language	Word	Meaning
1	Old Portuguese	bõo	good; ethical; good; pleasant
2	Latin	bonus	good, honest, brave, noble, kind, pleasant;...
3	Old Latin	duenos	Alternative form of duonus
4	Proto-Italic	dwenos	good
5	Proto-Indo-European	dew-	to show favour, revere; to fail, to lag, to be...

Every word from Proto-Indo-European dew- →Every word from Proto-Italic dwenos →Every word from Old Latin duenos →