Family name Rei-Niais (Rei-Niais 
) , all around the world, is an extremely rare surname. The last name Rei-Niais is characteristic of Western Europe, particularly France, where it is an extremely rare surname. Parts of the name also exists independently as a first name Rei, and a first name Niais.
| VARIANT | COUNTRY |
|---|---|
| Rei-Niais | France |