In all the world, Sigisfredo Antonio (Sigisfredo Antonio 
) is a very rare male forename. The forename Sigisfredo Antonio is characteristic of Chile, where it is a rare male name, and China, where it is an extremely rare masculine name. Much less frequently, Sigisfredo Antonio is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Sigisfredo Antonio | China, Chile |