The Proto-Anatolian word *h₂ebo-
Word *h₂ebo-
Meaning river
See also Carian: kb- ‘river’
Palaic: ḫa-a-ap-na-aš ‘river’
Hittite: ḫa-pa-aš ‘river’

Other words that might be of interest
*Háiʔus ‘rain’