Cognomen Онуоха (Onuoha 
, Онуоха 
) , worldwide, is a common last name. The surname Онуоха is characteristic of Sub-Saharan Africa, particularly Nigeria, where it is quite a common surname, Lesotho, and Niger, where it is quite a rare surname. Not in comparison with a country's population, it is the most numerous in Nigeria, Niger, and the United States. Also, Онуоха is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Onuoha | Nigeria, Niger, Cameroon, United States, Ghana |
| Онуоха | Russia, Ukraine |