Where does “esse” come from?

esse (Late Latin) comes from Latin esse, from Ancient Greek οὐσία, from Ancient Greek εἰμί, from Proto-Hellenic ehmi, from Proto-Indo-European h₁ésmi, from Proto-Indo-European h₁ēs- — to be.

Ancestry of “esse”, step by step

esse traces back through two separate lines of ancestry.

via Latin esse

StepLanguageWordMeaning
1Latinessepresent infinitive of sum; state, condition;...
2Ancient Greekοὐσίαthat which is one's own, one's substance,...
3Ancient GreekεἰμίTo be, exist; live; To be; it is possible
4Proto-Hellenicehmito be
5Proto-Indo-Europeanh₁ésmifirst-person singular present indicative of...
6Proto-Indo-Europeanh₁ēs-to be

via Classical Latin sum

StepLanguageWordMeaning
1Classical Latinsum
Every word from Proto-Indo-European h₁ēs-Every word from Proto-Indo-European h₁ésmiEvery word from Proto-Hellenic ehmi