Where does “hēap” come from?

hēap (Old English) comes from Proto-West Germanic haup, from Proto-Germanic haupaz, from Proto-Indo-European koupos — hill.

Ancestry of “hēap”, step by step

Step	Language	Word	Meaning
1	Proto-West Germanic	haup	—
2	Proto-Germanic	haupaz	a heap, pile; a crowd, throng
3	Proto-Indo-European	koupos	hill

hēap — Etymology, Origin & Word History | Etymology Explorer