Cognomen Райха (Rajha 
, Raiha 
, Raykha 
) , all over the world, is quite a rare surname. The cognomen Райха is habitual in Finland, where it is quite a common surname, Lebanon, and Syria, where it is quite a rare surname. In absolute terms, it is commonest in Finland, Lebanon, and India. Also, Райха is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Rajha | Indonesia, Syria, Lebanon, India, Democratic Republic of the Congo |
| Raiha | Indonesia, Malaysia, Finland, India, Bangladesh |
| Raykha | Thailand, United States, India, Canada, Brazil |
| Райха | Kyrgyzstan, Kazakhstan, Russia, Ukraine |