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Family name Islah (Islah , إصلاح , อิสลาม ) , all around the world, is quite a rare last name. The family name Islah is habitual in Morocco, where it is quite a rare surname, Thailand, and Malaysia. Measured by absolute frequency, this name is the most popular in Indonesia, Thailand, and Morocco. Likewise, Islah is the forename as well as the last name.