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Cognomen Cil (Keel , Cil , Csil ) , worldwide, is a common surname. The family name Cil is characteristic of Liechtenstein, where it is quite a common surname, Switzerland, and Estonia, where it is quite a rare surname. Not in comparison with a country's population, it is commonest in the United States, Switzerland, and Indonesia. Much less frequently, Cil is the forename as well as the last name.