Where does “հաւք” come from?

հաւք (Old Armenian) comes from Old Armenian հաւ, from Proto-Indo-European h₂éwh₂os — maternal grandfather; maternal uncle.

Ancestry of “հաւք”, step by step

Step	Language	Word	Meaning
1	Old Armenian	հաւ	bird; rooster; hen; grandfather, ancestor; uncle
2	Proto-Indo-European	h₂éwh₂os	maternal grandfather; maternal uncle