Mutawakkil
Yes. It denotes reliance on God (tawakkul), a valued spiritual quality in Islam, and has been used historically as an honorific/laqab.
Yes. 'Al‑Mutawakkil' was the regnal/laqab of an Abbasid caliph; forms of the name also appear in historical Muslim records.
The exact word 'Mutawakkil' as a proper name does not occur in the Quran; the verbal root related to tawakkul appears in Quranic discourse, but a direct verse reference for the name is not applicable.
Pronounced mu-ta-WAK-kil (approximate IPA /mu.ta.wak.kil/), with primary stress on the third syllable.
Yes. It conveys a positive, devotional meaning. Because of its historical use as a laqab, some families treat it as a rare and formal given name.