Family name Carl-Otto (Carl-Otto 
) , in the world, is an extremely rare surname. The family name Carl-Otto is habitual in Southern Europe, particularly Spain, where it is a very rare surname. Much more prevalently, Carl-Otto is the forename as well as the last name. Parts of the name also exists independently as a first name Carl, and a first name Otto.
| VARIANT | COUNTRY |
|---|---|
| Carl-Otto | Germany, Sweden, Norway, Spain, Denmark |