Cognomen Demarzo (Demarzo 
) , all over the world, is a rare surname. The family name Demarzo is characteristic of Italy, where it is a rare surname, the United States, and Canada, where it is a very rare surname. In absolute terms, it is commonest in the United States, Italy, and Brazil.
| VARIANT | COUNTRY |
|---|---|
| Demarzo | France, Canada, United States, Italy, Brazil |
| peter m. demarzo economist (Stanford University; National Bureau of Economic Research (NBER)) (b. 1900) |
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marcelo demarzo Brazilian physician and professor, BR (b. 1973) |
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| marcelo demarzo researcher |
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| lauren a demarzo researcher (ORCID 0000-0003-2704-2238) |
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| arthur p demarzo researcher (ORCID 0000-0002-1734-6599) |
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