Surname Арну (Arnoux 
, Arnould 
, Arnous 
) , all around the world, is a common cognomen. The last name Арну is characteristic of France, where it is quite a common surname, Belgium, and Syria. Much less frequently, Арну is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Arnoux | Belgium, Switzerland, United States, France, Democratic Republic of the Congo |
| Arnould | Ethiopia, Belgium, Switzerland, United States, France |
| Arnous | Belgium, Saudi Arabia, Syria, Egypt, France |
| Арну | Kyrgyzstan |