Moein ad-Deen is an indirect Quranic name for boys that means “helper of the faith”, one who helps and supports Islam. It is derived from Muin (helper), which comes from the Ain-W-N Quranic root, and Deen (religion, creed, faith), which comes from the D-Y-N Quranic root. Both of these roots are used often in the Quran and Deen is directly mentioned in the Quran.