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Family name Seun (Seun , سيون , セウン ) , around the globe, is a common last name. The cognomen Seun is habitual in Nigeria, where it is quite a common surname, Iceland, where it is quite a rare surname, and Namibia. In absolute terms, this name is the most popular in Nigeria, Niger, and Laos. Likewise, Seun is the forename as well as the last name.