Surname Idunno (Idunno 
) , around the world, is a very rare family name. The last name Idunno is habitual in Guatemala, where it is a rare surname, the United States, where it is an extremely rare surname, and the United Kingdom. Much less frequently, Idunno is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Idunno | Guatemala, United Kingdom, United States |