"Ulterior origin obscure" (OED). "Already found in the Glosses of Junius, which Graif assigns to the eighth or ninth century" (Hehn 1888: 360). "De västgerm. språken ha ett inhemskt uttryck: *hoppan- i ty. hopfen ov., besl. med ty. dial. hupp, tofs (efter humlekottarna); själva växten är hos germanerna inhemsk" (SEO). Middle Dutch hoppe = late OHG. hopfo = medieval Latin hupa (for *huppa) (OED).
Lübben, August (1888). Mittelniederdeutsches Handwörterbuch. Norden: Soltau
Simpson, J., & Weiner, E. S. 1989. Oxford English dictionary. Oxford: Clarendon Press.
Robert Farren, PIE culture words collection, 2017
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