Where does “ἑαυτός” come from?

ἑαυτός (Byzantine Greek) comes from Ancient Greek ἑαυτοῦ, from Ancient Greek αὐτοῦ — here, there; masculine/neuter genitive singular...

Ancestry of “ἑαυτός”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	ἑαυτοῦ	himself, herself, itself, themselves; used for...
2	Ancient Greek	αὐτοῦ	here, there; masculine/neuter genitive singular...