Or papaḫḫu, pāpaḫu.
Evidently related to Sum. pa-paḫ “reception room, cella” and sometimes considered to be borrowed from it (e.g., SLOB No. 551). Since, however, Sum. pa-paḫ is always written syllabically and has no clear internal etymology, it is possible that the two lexemes have been borrowed from a third language (AHw. 823).