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Surname Diala (Diala , ديالا , ديالى ) , across the world, is a common cognomen. The family name Diala is habitual in Iraq, where it is quite a common surname, Lebanon, where it is quite a rare surname, and Philippines. Measured by absolute frequency, it is commonest in Iraq, Philippines, and Nigeria. Likewise, Diala is the forename as well as the last name.