Where does “hārhūne” come from?

hārhūne (Old English) comes from Old English hār, from Proto-Germanic hairaz, from Proto-Indo-European (s)ḱeh₃- — darkness, shadow.

Ancestry of “hārhūne”, step by step

Step	Language	Word	Meaning
1	Old English	hār	gray, gray-haired; grey-haired; hoar, hoary,...
2	Proto-Germanic	hairaz	grey; aged; old; lofty; distinguished
3	Proto-Indo-European	(s)ḱeh₃-	darkness, shadow

hārhūne — Etymology, Origin & Word History | Etymology Explorer