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Cognomen Dyal (Dial , Dyal , Diall ) , in the entire world, is a common family name. The surname Dyal is characteristic of Senegal, where it is quite a common surname, Trinidad and Tobago, and Mauritius. Measured by absolute frequency, it is the most numerous in the United States, India, and Senegal. Much less frequently, Dyal is the forename as well as the last name.