Where does “-utus” come from?

-utus (Latin) comes from Latin -tus, from Proto-Italic -tus, from Proto-Indo-European -tus — Derives action nouns from verb roots.

Ancestry of “-utus”, step by step

Step	Language	Word	Meaning
1	Latin	-tus	Forms the past participle of verbs; Forms...
2	Proto-Italic	-tus	—
3	Proto-Indo-European	-tus	Derives action nouns from verb roots