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Family name Kosie (Kosie ) , worldwide, is a rare surname. The cognomen Kosie is habitual in Lesotho, where it is quite a rare surname, South Africa, where it is a rare surname, and Canada, where it is a very rare surname. Not in comparison with a country's population, this name is the most popular in Sub-Saharan Africa, particularly Lesotho, South Africa, and Nigeria. Also, Kosie is the forename as well as the last name.