Surname Sigisfredo Antonio (Sigisfredo Antonio 
) , in all the world, is a very rare last name. The last name Sigisfredo Antonio is habitual in Latin America and the Caribbean, particularly Chile, where it is a rare surname. More frequently, Sigisfredo Antonio is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sigisfredo Antonio | Chile, China |