Last name جانيرو (Janiro 
, Janero 
, جانيرو) , all around the world, is a rare cognomen. The family name جانيرو is characteristic of the United States, where it is a very rare surname, Indonesia, and Philippines. Not in comparison with a country's population, it is the most numerous in the United States, Indonesia, and Brazil. Also, جانيرو is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Janiro | Philippines, Brazil, India, Venezuela, United States |
| Janero | Indonesia, Philippines, Brazil, United States, Nigeria |