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Family name Blay (Blay , Блай , Блэй) , in the entire world, is a common last name. The surname Blay is habitual in Ghana, where it is quite a common surname, Guadeloupe, and Israel, where it is quite a rare surname. Not in comparison with a country's population, it is the most numerous in Ghana, France, and Philippines. Much less frequently, Blay is the forename as well as the last name.