Family name رايكو (Rajko 
, Raiko 
, رايكو) , around the world, is quite a rare cognomen. The surname رايكو is characteristic of Southern Europe, particularly Slovenia, where it is quite a common surname, Montenegro, and Croatia, where it is quite a rare surname. In absolute terms, it most frequently occurs in Slovenia, Japan, and Croatia. More frequently, رايكو is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Rajko | Montenegro, Bosnia and Herzegovina, Slovenia, Serbia, Croatia |
| Raiko | Japan, Cuba, United States, Germany, India |