a wood on a steep hillside

Old English hnot is 'bald, smooth' and hnutu 'nut' (link). -(h)anger toponymically means 'a meadow or grassplot, usually by the side of the road' (link). One wonders if the -th- represents a /θ/ or a /t/. Nut-hanger or Nothing-er.

[Edited typo.]

Ceci n'est pas un seing.