Surname Ntoumbani-Koubayana (Ntoumbani-Koubayana 
) , in all the world, is a rare family name. The surname Ntoumbani-Koubayana is habitual in Sub-Saharan Africa, particularly the Democratic Republic of the Congo, where it is a rare surname. Parts of the name also exists independently as a last name Koubayana.
| VARIANT | COUNTRY |
|---|---|
| Ntoumbani-Koubayana | Democratic Republic of the Congo |