Where does “Muharam” come from?

Muharam (Malay) comes from Arabic مُحَرَّم, from Arabic حَرَّمَ — to forbid.

Ancestry of “Muharam”, step by step

Step	Language	Word	Meaning
1	Arabic	مُحَرَّم	forbidden
2	Arabic	حَرَّمَ	to forbid

Muharam — Etymology, Origin & Word History | Etymology Explorer