Where does “trivial” come from?

trivial (Middle French) comes from Latin trivialis, from Latin trivius, from Latin tri-, from Latin trēs, from Proto-Italic trēs, from Proto-Indo-European *tréyes.

Ancestry of “trivial”, step by step

Step	Language	Word	Meaning
1	Latin	trivialis	common, commonplace, ordinary, trivial
2	Latin	trivius	of or belonging to crossroad temples
3	Latin	tri-	three, tri-
4	Latin	trēs	three; 3
5	Proto-Italic	trēs	three
6	Proto-Indo-European	*tréyes	—

Words derived from “trivial”

triviaal
trivialiseren
trivialisering

Every word from Proto-Indo-European *tréyes →Every word from Proto-Italic trēs →Every word from Latin trēs →