Cognomen جانيو (Janio 
, Jânio 
, جانيو) , all over the world, is quite a rare last name. The cognomen جانيو is habitual in Nicaragua, where it is quite a rare surname, Philippines, where it is a rare surname, and Honduras. Not in comparison with a country's population, it is commonest in Philippines, Venezuela, and Nicaragua. More frequently, جانيو is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Janio | Brazil, Peru, Philippines, Poland, Angola |
| Jânio | Brazil, United States, Angola |