Last name Райка (Райка 
, Rajka 
, Raika 
) , globally, is a common family name. The surname Райка is characteristic of Bhutan, where it is quite a common surname, Bulgaria, and Fiji, where it is quite a rare surname. Not in comparison with a country's population, it is commonest in India, Bulgaria, and Bhutan. Likewise, Райка is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Райка | Bulgaria, Kazakhstan, Russia, Kyrgyzstan |
| Rajka | Montenegro, Bosnia and Herzegovina, Serbia, India, Croatia |
| Raika | Brazil, Bulgaria, India, Bangladesh, Bhutan |
| Rayka | Brazil, Indonesia, Bulgaria, India, Bangladesh |