Müslüm is a Turkish and Azerbaijani masculine given name, the local form of Muslim. The name Muslim itself derives from the Arabic word أسْلم (ʾaslama) meaning "to surrender, to submit" — and refers to a follower of the religion of Islam. Through natural linguistic adaptation, the name entered Turkish and Azerbaijani as Müslüm, using the letter ü to represent the vowel sound.
Etymology
According to the root meaning from Arabic, Muslim conveys a sense of "pure, clear, immaculate, virtuous, pious, obedient, submissive"—qualities that are highly valued in Islamic faith and practice. As explained in the underlying etymology, it is ultimately derived from the concept of أسْلم, highlighting the core Islamic principle of total surrender to God. It also form a part of the name Aslam, of which it is a diminutive form.
Sources: Wikipedia — Muslim (name)