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Family name Gilley (吉利 , Gilley , Гилли ) , across the world, is a common cognomen. The family name Gilley is habitual in Jersey, where it is quite a common surname, Guernsey, and the United States, where it is quite a rare surname. In absolute terms, it is the most numerous in the United States, China, and the United Kingdom. Likewise, Gilley is the forename as well as the last name.