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Family name Ishag (Ishag , إسحاق , Исхаг ) , throughout the world, is a common last name. The cognomen Ishag is habitual in Sudan, where it is quite a common surname, Maldives, where it is quite a rare surname, and Libya. Measured by absolute frequency, this name is the most popular in Sudan, Egypt, and Saudi Arabia. Much less frequently, Ishag is the forename as well as the last name.