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Family name Gaddis (Gaddis , גדיס ) , all around the world, is quite a common cognomen. The surname Gaddis is characteristic of the United States, where it is quite a rare surname, Israel, and New Zealand, where it is a rare surname. Not in comparison with a country's population, this name is the most popular in the United States, Israel, and Egypt. Much less frequently, Gaddis is the forename as well as the last name.