Surname Siffredo (Siffredo 
) , worldwide, is a very rare family name. The family name Siffredo is habitual in Latin America and the Caribbean, particularly Uruguay, where it is a rare surname. Very seldom, Siffredo is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Siffredo | Italy, United States, Uruguay |
| siffredo reynardi bishop of the Roman Catholic Church |
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| siffredo di tommaso bishop of the Roman Catholic Church |
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