The Hittite word ḫu-uḫ-ḫa-aš
Word ḫu-uḫ-ḫa-aš
IPA ḫuḫḫa
Meaning grandfather
See also Armenian: haw ‘grandfather’
Lycian: xuga ‘grandfather’
C. Luwian: ḫu-ḫa ‘grandfather’

Other words that might be of interest
ḫa-aš-ša-aš ‘descendant’, ne-ga-an ‘sister’, ne-ek-na ‘brother’, kuu̯an- ‘woman’, pe-eš-ne ‘man, male, person’, an-tu-ua-aḫ-ḫa-aš ‘man, human being, person’, an-na-aš ‘mother’, at-ta-aš ‘father’