Last name Sewanou (Sewanou 
) , all around the world, is a rare surname. The cognomen Sewanou is habitual in Benin, where it is quite a rare surname, Ethiopia, where it is a rare surname, and France, where it is a very rare surname. Measured by absolute frequency, the name is most common in Sub-Saharan Africa, particularly Ethiopia, Benin, and Nigeria. Much less frequently, Sewanou is the forename as well as the last name.