From [[w:|]][[Category: derivations|Eider]] æðar, genitive of æðr, probably reaching English via [[w:|]][[Category: derivations|Eider]] eider (now ejder).
From [[w:|]][[Category: derivations|Eider]] æðar, genitive of æðr, probably reaching English via [[w:|]][[Category: derivations|Eider]] eider (now ejder).