Where does “ser” come from?

ser (Asturian) comes from Late Latin essere, from Latin sūm, from Proto-Italic ezom, from Proto-Indo-European h₁ésmi, from Proto-Indo-European h₁ēs- — to be.

ser (Asturian): to be; being

Definitions

to be; being

Ancestry of “ser”, step by step

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

Words derived from “ser”

yes
soi
sois

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