He who acts with extreme kindness
The name Ar-Raheem (in Arabic: ٱلْرَّحِيْمُ) comes from the same root as Ar-Rahman which refers to Allah’s attribute of being Merciful. Although similarly related the meanings are different. Ar-Rahman can be understood to refer to Allah as the origination/source of all mercy, whereas Ar-Raheem refers to its sustaining/infiniteness. Some view the name of Ar-Raheem as being merciful to His creation deserving of mercy (primarily the mercy reserved for the believers).