Family name Similus (Similus 
) , in the world, is a very rare last name. The cognomen Similus is habitual in the Dominican Republic, where it is a rare surname, the United States, where it is an extremely rare surname, and Brazil. Very seldom, Similus is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Similus | Brazil, United States, Dominican Republic |