Cognomen Arja-Riitta (Arja-Riitta 
) , throughout the world, is an extremely rare surname. Much more prevalently, Arja-Riitta is the forename as well as the last name. Parts of the name also exists independently as a last name Arja, and a first name Riitta.
| VARIANT | COUNTRY |
|---|---|
| Arja-Riitta | Finland |