Family name Ильва (Ylva 
, Ильва 
) , around the world, is a rare last name. The cognomen Ильва is characteristic of Sweden, where it is a rare surname, Venezuela, and Norway, where it is a very rare surname. In absolute terms, it is commonest in Sweden, Venezuela, and Spain. Much more frequently, Ильва is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ylva | Germany, Sweden, Norway, United States, Venezuela |
| Ильва | Russia |