Where does “Ero” come from?

Ero (Italian) comes from Italian eroina, from French héroïne, from German Heroin, from Latin hērōina, from Ancient Greek ἡρωΐνη, from Ancient Greek ἥρως, from Proto-Indo-European sēr-, from Proto-Indo-European ser- — to flow; to guard; to bind, to tie together.

Ero (Italian): Hero

Definitions

Hero

Ancestry of “Ero”, step by step

Ero traces back through two separate lines of ancestry.

via Italian eroina

Step	Language	Word	Meaning
1	Italian	eroina	heroine; heroin
2	French	héroïne	heroine; heroin
3	German	Heroin	heroin
4	Latin	hērōina	heroine
5	Ancient Greek	ἡρωΐνη	Alternative spelling of ἡρωίνη
6	Ancient Greek	ἥρως	a hero of the Trojan War: any of the major...
7	Proto-Indo-European	sēr-	to flow
8	Proto-Indo-European	ser-	to flow; to guard; to bind, to tie together

via Ancient Greek Ἡρώ

Step	Language	Word	Meaning
1	Ancient Greek	Ἡρώ	—
2	Ancient Greek	-ω	ending of the first-person singular thematic present
3	Proto-Indo-European	-éti	Forms

Every word from Proto-Indo-European ser- →Every word from Proto-Indo-European sēr- →Every word from Ancient Greek ἥρως →