Cognomen Rehay (Rehay 
) , across the world, is a very rare last name. The family name Rehay is characteristic of Greece, where it is a very rare surname, Argentina, where it is an extremely rare surname, and India. More frequently, Rehay is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Rehay | Argentina, Turkey, South Africa, Greece, India |