出典:Wiktionary
Uncertain, although probably an irregular romanization of the Mandarin pronunciation of Chinese 戶部 (Hùbù), the imperial government's Board of Revenue which oversaw customs and other taxation during the Qing Dynasty. In reference to its agents, a clipping of earlier hoppo-man.
hoppo (countable かつ uncountable, 複数形 hoppos または hoppoes)