Salaam

google

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early 17th century: from Arabic (al-)salām (‘alaikum) ‘peace (be upon you)’.

wiktionary

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From Arabic سَلَام‎ (salām, “peace”). Doublet of shalom, a borrowing from Hebrew.

etymonline

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salaam

Muslim greeting, 1610s, from Arabic salam (also in Urdu, Persian), literally "peace" (compare Hebrew shalom); in full, (as)salam 'alaikum "peace be upon you," from base of salima "he was safe" (compare Islam, Muslim).