Last name Koumassou (Koumassou 
) , globally, is a rare surname. The family name Koumassou is habitual in Benin, where it is quite a rare surname, Ivory Coast, where it is a rare surname, and France, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Koumassou | France, Ivory Coast, Canada, United States, Benin |