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Cognomen Onyebuchi (Onyebuchi ) , in the entire world, is a common family name. The last name Onyebuchi is characteristic of Nigeria, where it is quite a common surname, Niger, where it is quite a rare surname, and United Arab Emirates. Measured by absolute frequency, it is the most numerous in Sub-Saharan Africa, particularly Nigeria, Niger, and Ghana. Likewise, Onyebuchi is the forename as well as the last name.