Where does “Seres” come from?

Seres (Latin) comes from Ancient Greek Σῆρες, from Old Chinese 絲 — silk.

Ancestry of “Seres”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	Σῆρες	a people of Eastern Asia, the modern Chinese,...
2	Old Chinese	絲	silk

Seres — Etymology, Origin & Word History | Etymology Explorer