Surname Idonia (Idonia 
) , worldwide, is a very rare cognomen. The cognomen Idonia is habitual in Honduras, where it is a very rare surname, Nicaragua, and Italy. In absolute terms, it is the most numerous in Italy, Mexico, and China. Also, Idonia is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Idonia | Italy, Mexico, Peru, United States, China |