Cognomen Rosalya (Rosalya 
, Росалиа 
) , across the world, is a rare last name. The cognomen Rosalya is characteristic of Indonesia, where it is a very rare surname, Spain, where it is an extremely rare surname, and Venezuela. Not in comparison with a country's population, it most frequently occurs in Indonesia, Spain, and Philippines. Likewise, Rosalya is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Rosalya | Philippines, Brazil, United States, India, Indonesia |
| Росалиа | Russia |