Last name Viwanou (Viwanou 
) , in the world, is a rare surname. The surname Viwanou is habitual in Ethiopia, where it is a very rare surname, and the United States, where it is an extremely rare surname. Very seldom, Viwanou is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Viwanou | Ethiopia, United States, Brazil |