Where does “Νηρῇς” come from?

Νηρῇς (Ancient Greek) comes from Ancient Greek Νηρεύς — Nereus; the sea-god Nereus.

Ancestry of “Νηρῇς”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	Νηρεύς	Nereus; the sea-god Nereus

Νηρῇς — Etymology, Origin & Word History | Etymology Explorer