The Armenian word haw
Word haw
Meaning grandfather
See also Proto-Indo-European: *awo- ‘grandfather, adult male relative other than one's father’
Cappadocian Greek: αβούκα ‘grandfather’
Hittite: huhha- ‘grandfather’
Hittite: ḫu-uḫ-ḫa-aš ‘grandfather’

Other words that might be of interest
ayr ‘man’, kin ‘woman, wife’, elbayr ‘brother’, mayr ‘mother’, hayr ‘father’, mard ‘man, mortal’, mawru-a ‘stepmother’, skesur ‘mother-in-law’