Muslim

google

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early 17th century: from Arabic, active participle of 'aslama (see Islam).

wiktionary

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Borrowed around 1615 from Arabic مُسْلِم‎ (muslim, “one who submits”), the active participle of أَسْلَمَ‎ (ʾaslama, “he submitted”), verb form IV from the triliteral root س ل م‎ (s-l-m), "to be whole, intact". The verbal noun إسْلام‎ (ʾislām) means literally "submission". In a religious sense, الْإِسْلَام‎ (al-ʾislām) translates to "faith, piety", and مُسْلِم‎ (muslim) to "one who has (religious) faith or piety".

etymonline

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Muslim (n.)

"one who professes Islam," 1610s, from Arabic muslim "one who submits" (to the faith), from root of aslama "he resigned." Related to Islam. From 1777 as an adjective.