Cognomen Gai-Niangui (Gai-Niangui 
) , all around the world, is a rare family name. The last name Gai-Niangui is characteristic of 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 Gai, and a last name Niangui.
| VARIANT | COUNTRY |
|---|---|
| Gai-Niangui | Democratic Republic of the Congo |