Believer or faithful
Derived from the Arabic root meaning 'to believe' or 'to be faithful.' In an Islamic context, it refers specifically to a believer who has complete submission to the will of Allah and has inward faith. It is one of the names of God in the Quran (Al-Mu'min), signifying the Giver of Peace and the Guardian of Faith.
Less common today
Mumin isn't in the latest US Top 1000. It last peaked at #7,791 in 2016.
Djiboutian long-distance runner
US births per 5-year period, 1990βpresent (SSA data).