Mamun Is A Boys Name Of Arabic Origin. As It Means "trustworthy," This Name Is A Great Way To Inspire Your Son To Be Reliable And Honest Wherever They Go. Popular Among Muslim Families, Mamun Is A Lovely Way To Express Your Faith While Welcoming Your Little One Into The Community. Baby Mamun Is Sure To Win Others Over Throughout Life By Honoring Their Word And Remaining Loyal To Loved Ones.