Where does “esti” come from?

esti (Esperanto) comes from French est, from Middle French est, from Old French est, from Latin est, from Proto-Indo-European h₁ésti, from Proto-Indo-European h₁es- — to be.

esti (Esperanto): to be

Definitions

to be

Ancestry of “esti”, step by step

esti traces back through 3 separate lines of ancestry.

via French est

Step	Language	Word	Meaning
1	French	est	east; third-person singular present indicative of...
2	Middle French	est	third-person singular present indicative of estre
3	Old French	est	third-person singular present indicative of estre
4	Latin	est	third-person singular present active indicative...
5	Proto-Indo-European	h₁ésti	to be
6	Proto-Indo-European	h₁es-	to be

via Italian essere

Step	Language	Word	Meaning
1	Italian	essere	Used as a to be
2	Late Latin	essere	—
3	Latin	sūm	to be, exist
4	Proto-Italic	ezom	to be
5	Proto-Indo-European	h₁ésmi	first-person singular present indicative of...
6	Proto-Indo-European	h₁ēs-	to be

via Ancient Greek ἐστί

Step	Language	Word	Meaning
1	Ancient Greek	ἐστί	third-person singular present active indicative...

Words derived from “esti”

Every word from Proto-Indo-European h₁es- →Every word from Proto-Indo-European h₁ésti →Every word from Latin est →