Cognomen Onwugbonu (Onwugbonu 
) , across the world, is a rare family name. The last name Onwugbonu is habitual in Nigeria, where it is a very rare surname, South Africa, and the United Kingdom, where it is an extremely rare surname. Likewise, Onwugbonu is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Onwugbonu | South Africa, Canada, United States, United Kingdom, Nigeria |