heavy – тяжелый;

heavy (adj.) (староанглийское «hefig» - взявший излишний вес, важный, веский, гнетущий, медленный, скучный); из протогерманского *hafiga; из *kap- хапать.
Old English hefig "heavy, having much weight; important, grave; oppressive; slow, dull," from Proto-Germanic *hafiga "containing something; having weight" (cognates: Old Saxon, Old High German hebig, Old Norse hofugr, Middle Dutch hevich, Dutch hevig), from PIE *kap- "to grasp" (see capable). Jazz slang sense of "profound, serious" is from 1937 but would have been comprehensible to an Anglo-Saxon. Heavy industry recorded from 1932. Heavy metal attested by 1839 in chemistry; in nautical jargon from at least 1744 in sense "large-caliber guns on a ship.

Якобы, протогерманское, «хапуга». Далее – замена «п» - «v». ХПГ – HPG – hfg – hefig (hebig) – hv – heavy.