Where does “مسلم” come from?

مسلم (Arabic) comes from Arabic أَسْلَمَ, from Arabic ل, from Proto-Semitic *lV-.

Ancestry of “مسلم”, step by step

Step	Language	Word	Meaning
1	Arabic	أَسْلَمَ	to surrender, to become a Muslim; he submitted
2	Arabic	ل	to, for, belonging to; لَـ •; Used to express...
3	Proto-Semitic	*lV-	—

مسلم — Etymology, Origin & Word History | Etymology Explorer