*aiwukiz

Probably from a Proto-Indo-European compound approximately *h₂oyu-gʷih₃- or *h₂yu-gʷih₃-, literally ‘ever-living’, from *h₂óyu ~ *h₂yéw- from root *h₂ey- + *gʷih₃-, from a zero-grade form of root *gʷeyh₃-; related to *aiwaz. Compare Latin iūgis, Ancient Greek ὑγιής (hugiḗs), and Avestan -𐬘𐬍‎- 𐬫𐬀𐬎𐬎𐬀𐬈 (yauuaē-ǰī-) (Kroonen 2013: s.v. *ajuki-; Mallory & Adams 1997: 356; Weiss 1994: 131–56). Þórhallsdóttir, as cited by Weiss, derives Germanic *aju- from analogically generalized prevocalic *aiw-: *aiwu- > *aju- through loss of w before u; the resulting intervocalic *-j- arose only after the Proto-Germanic deletion of inherited intervocalic *-j- and was therefore preserved (Ringe 2017: 161 n. 27; Weiss 1994: 147–48).