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Last name Agui (Agui , アグイ , 阿桂 ) , in the entire world, is quite a common family name. The last name Agui is characteristic of Ivory Coast, where it is quite a rare surname, Japan, and Guatemala. Measured by absolute frequency, it is commonest in Japan, Ivory Coast, and Peru. Much less frequently, Agui is the forename as well as the last name.