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Family name Onyema (Onyema ) , globally, is a common last name. The cognomen Onyema is habitual in Nigeria, where it is quite a common surname, Niger, where it is quite a rare surname, and United Arab Emirates, where it is a rare surname. In absolute terms, this name is the most popular in Nigeria, Niger, and the United States. Also, Onyema is the forename as well as the last name.