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Cognomen Dalil (Dalil , دليل , Далил ) , in the entire world, is a common surname. The cognomen Dalil is characteristic of Sudan, where it is quite a common surname, Morocco, where it is quite a rare surname, and Syria. Measured by absolute frequency, the name is most common in Sudan, Morocco, and Indonesia. Likewise, Dalil is the forename as well as the last name.