Dzhuhan is most likely a cognate of Polish Dżugan and both a geographically close (compare
https://nazwiska.ijp.pan.pl/haslo/print/name/DŻUGAN and
https://ridni.org/karta/Джуга%D0%BD). The source of the Polish surname according to ISNP is the dialectal verb 'dziugać' meaning "to nudge; to hit; to slide". Dzhuha (Джуга) probably has the same origin as well.