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 | Democratic Republic of the Congo, India, Indonesia, Syria, Lebanon |
| Raiha | Bangladesh, Finland, India, Indonesia, Malaysia |
| Raykha | Canada, Thailand, Brazil, United States, India |
| Райха | Kazakhstan, Ukraine, Russia, Kyrgyzstan |