Etymology tree Proto-Indo-European *ḱe? Proto-Indo-European *ḱóm Proto-Italic *kom Proto-Italic *kom- Latin co- Proto-Indo-European *h₃ep-der. Proto-Italic *opis Latin ops Latin cōps Proto-Indo-European *-yós Proto-Italic *-ios Old Latin -ios Latin -ius Latin -ia Latin cōpia From cōps + -ia.