Last name Joannu (Joannu 
) , around the globe, is a very rare cognomen. The cognomen Joannu is habitual in France, where it is a very rare surname, Germany, where it is an extremely rare surname, and the United Kingdom. Very seldom, Joannu is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Joannu | Germany, United Kingdom, France, United States, India |