From Middle English hevy, heviȝ, from Old English hefiġ, hefeġ, hæfiġ, from Proto-West Germanic *habīg ("heavy, hefty, weighty"), from Proto-Germanic *habīgaz ("heavy, hefty, weighty"), from Proto-Indo-European *keh₂p- ("to take, grasp, hold").
Cognate with Scots hevy, havy, heavy, Dutch hevig ("violent, severe, intense, acute"), Middle Low German hēvich ("violent, fierce, intense"), German hebig (compare heftig), Icelandic höfugur ("heavy, weighty, important"), Latin capāx ("large, wide, roomy, spacious, capacious, capable, apt").