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 | Philippines, France, Indonesia, Italy, Brazil |
| Berthod | Spain, France, Switzerland, United States, Italy |
| Bertheau | Switzerland, France, United States, Brazil, Mexico |
| Берто | Russia, Ukraine |