Where does “Greta” come from?

Greta (Swedish) comes from Swedish Margareta, from Latin margarīta, from Ancient Greek μαργαρίτης, from Proto-Iranian *mŕ̥ga-ahri-ita-.

Ancestry of “Greta”, step by step

Step	Language	Word	Meaning
1	Swedish	Margareta	Margaret
2	Latin	margarīta	—
3	Ancient Greek	μαργαρίτης	pearl; a type of Egyptian plant
4	Proto-Iranian	*mŕ̥ga-ahri-ita-	—

Greta — Etymology, Origin & Word History | Etymology Explorer