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Last name Cossie (Cossie ) , throughout the world, is a rare surname. The last name Cossie is characteristic of South Africa, where it is a rare surname, New Zealand, and Argentina, where it is a very rare surname. Not in comparison with a country's population, this name is the most popular in South Africa, the United States, and Argentina. Likewise, Cossie is the forename as well as the last name.