Surname Ianau (Ianau 
) , worldwide, is a rare last name. The last name Ianau is characteristic of Romania, where it is quite a rare surname, Italy, where it is a very rare surname, and the United Kingdom, where it is an extremely rare surname. Much less frequently, Ianau is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ianau | Romania, United Kingdom, Italy, Nigeria, United States |