Family name Poincon-Billy (Poincon-Billy 
) , in all the world, is a rare last name. The family name Poincon-Billy 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 Poincon, and a first name Billy.
| VARIANT | COUNTRY |
|---|---|
| Poincon-Billy | Democratic Republic of the Congo |