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Surname Otu (Otu ) , around the world, is a common last name. The last name Otu is habitual in Sub-Saharan Africa, particularly Ghana, where it is quite a common surname, Nigeria, and Cameroon, where it is quite a rare surname. Measured by absolute frequency, this name is the most popular in Nigeria, Ghana, and Turkey. Also, Otu is the forename as well as the last name.