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Cognomen Siff (سيف , Siff , סיף ) , worldwide, is a common last name. The surname Siff is characteristic of Western Asia, particularly Yemen, where it is quite a common surname, Jordan, and Palestinian Territory (explore the name in all countries). Not in comparison with a country's population, it is the most numerous in Yemen, Egypt, and Iraq. More prevalently, Siff is the forename as well as the last name.