Family name Idoia (Idoia 
, Идоя 
) , all around the world, is quite a rare cognomen. The surname Idoia is habitual in Spain, where it is quite a rare surname, Venezuela, where it is a very rare surname, and Mexico, where it is an extremely rare surname. More prevalently, Idoia is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Idoia | Paraguay, Finland, France, Spain, Afghanistan |
| Идоя | Russia |