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Cognomen Guill (جويل , 吉尔 , Guill ) , in all the world, is quite a rare family name. The last name Guill is characteristic of Luxembourg, where it is quite a rare surname, Nicaragua, and Syria. Not in comparison with a country's population, the name is most common in the United States, Spain, and China. Also, Guill is the forename as well as the last name.