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Family name Guil (Guil , Гиль ) , in the world, is quite a common surname. The last name Guil is characteristic of Belarus, where it is quite a common surname, Guatemala, where it is quite a rare surname, and Kazakhstan. Not in comparison with a country's population, it is the most numerous in Belarus, Russia, and France. Much less frequently, Guil is the forename as well as the last name.