The C. Luwian word ḫa-a-pi-iš
Word ḫa-a-pi-iš
IPA ḫāpiš
Meaning river
See also Proto-Indo-European: *ab- ‘water, river’
Tocharian B: āp ‘river’
Carian: kb- ‘river’
Palaic: ḫa-a-ap-na-aš ‘river’
Hittite: ḫa-pa-aš ‘river’

Other words that might be of interest
ha-a-pi-in-ni ‘stream, small river’, a-la-aš-ša-am- ‘sea’, wa-a-ar-ša ‘water’, a-ar-ši-ya- ‘to flow’