Where does “eas” come from?

eas (Irish) comes from Middle Irish es, from Old Irish [[nes]]([[ness.

eas (Irish): waterfall, cascade, rapid; stoat, weasel

Definitions

Step	Language	Word	Meaning
1	Middle Irish	es	stoat, weasel
2	Old Irish	[[nes]]([[ness	—

eas — Etymology, Origin & Word History | Etymology Explorer