Last name Oatu (Oatu 
) , in the entire world, is a rare surname. The cognomen Oatu is habitual in Romania, where it is a rare surname, Spain, where it is a very rare surname, and Italy, where it is an extremely rare surname. Also, Oatu is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Oatu | Romania, Italy, Spain, India, Brazil |