Surname Lillen (Lillen 
) , worldwide, is a very rare last name. The cognomen Lillen is characteristic of Latin America and the Caribbean, particularly Nicaragua, where it is a very rare surname, Venezuela, where it is an extremely rare surname, and Mexico. In absolute terms, it is commonest in Nigeria, Nicaragua, and Mexico. More frequently, Lillen is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Lillen | Philippines, Venezuela, Sweden, United States, Nigeria |