Cognomen Erlkönig (Elis 
, Eller , Elre 
) , worldwide, is a common family name. The last name Erlkönig is characteristic of Estonia, where it is quite a common surname, Venezuela, and Austria. In absolute terms, it is commonest in the United States, Germany, and Indonesia. More frequently, Erlkönig is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Elis | Brazil, United States, Indonesia, Venezuela, Germany |
| Eller | Brazil, Indonesia, United States, Venezuela, Germany |
| Elre | Honduras, Philippines, Brazil, Indonesia, United States |