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Surname उदय (Uday , Daya , Udai ) , all over the world, is a common last name. The last name उदय is characteristic of Lesotho, where it is quite a common surname, Israel, and Lebanon, where it is quite a rare surname. Not in comparison with a country's population, the name is most common in India, Indonesia, and Philippines. Much more prevalently, उदय is the forename as well as the last name.