Where does “sumus” come from?

sumus (Latin) comes from Proto-Italic ezom, from Proto-Indo-European h₁ésmi, from Proto-Indo-European h₁ēs- — to be.

Ancestry of “sumus”, step by step

StepLanguageWordMeaning
1Proto-Italicezomto be
2Proto-Indo-Europeanh₁ésmifirst-person singular present indicative of...
3Proto-Indo-Europeanh₁ēs-to be

Words derived from “sumus”

Every word from Proto-Indo-European h₁ēs- →Every word from Proto-Indo-European h₁ésmi →Every word from Proto-Italic ezom →