Cognomen Onwu (Onwu 
) , worldwide, is quite a common last name. The surname Onwu is habitual in Nigeria, where it is quite a rare surname, the United Kingdom, where it is a very rare surname, and the United States. Not in comparison with a country's population, it is the most numerous in Nigeria, the United States, and Indonesia. Likewise, Onwu is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Onwu | Indonesia, United Kingdom, South Africa, United States, Nigeria |
| simon onwu Nigerian medical doctor (1908-1969), GB (b. 1908) |
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| manuel onwu Spanish footballer, ES (b. 1988) |
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| gilbert oke martin onwu |
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