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