Where does “Muharram” come from?

Muharram comes from Arabic مُحَرَّم, the past participle of Arabic حَرَّمَ meaning "to forbid" or "to make sacred."

Ancestry of “Muharram”, step by step

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

Muharram — Etymology, Origin & Word History | Etymology Explorer