Cognomen Zwieback (Biscotto 
, Zwieback ) , across the world, is a rare last name. The surname Zwieback is characteristic of Italy, where it is a rare surname, Brazil, and Australia, where it is a very rare surname. In absolute terms, it is commonest in Italy, Brazil, and the United States. Very seldom, Zwieback is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Biscotto | China, Italy, Australia, United States, Brazil |
| Zwieback | United States |
| ludwig zwieback Austrian entrepreneur, HU (b. 1844) |
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| emanuel zwieback Austrian entrepreneur, HU (b. 1850) |
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| ella zirner-zwieback Austrian entrepreneur, AT (b. 1878) |
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| wolfgang krause zwieback German actor and writer, DE (b. 1951) |
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| s. zwieback researcher ORCID ID = 0000-0002-1398-6046 |
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| onkel zwieback Rapper, hip hop musician, record producer, DE (b. 1981) |
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