Cognomen Берто (Berto 
, Berthod 
, Bertheau 
) , in the entire world, is a common last name. The cognomen Берто is habitual in Guernsey, where it is quite a common surname, Italy, and France, where it is quite a rare surname. Measured by absolute frequency, it is the most numerous in Brazil, Italy, and France. Likewise, Берто is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Berto | Indonesia, Italy, Philippines, France, Brazil |
| Berthod | Italy, Spain, Switzerland, United States, France |
| Bertheau | Mexico, Switzerland, United States, France, Brazil |
| Берто | Russia, Ukraine |