Where does “μύδια” come from?

μύδια (Greek) comes from Greek μύδι, from Ancient Greek μύδιν, from Ancient Greek μύδιον, from Ancient Greek μῦς, from Proto-Hellenic *mū́s, from Proto-Indo-Iranian múHs, from Proto-Indo-European múh₂s — mouse.

μύδια (Greek): Nominative plural form of μύδι;...