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Family name Dhak (Dhak , ضحاك ) , across the world, is a common last name. The last name Dhak is habitual in India, where it is quite a rare surname, Oman, where it is a rare surname, and Morocco. Measured by absolute frequency, the name is most common in India, Iran, and Morocco. Much less frequently, Dhak is the forename as well as the last name.