Last name Demarchi (Demarchi 
) , in the world, is a common cognomen. The last name Demarchi is habitual in Argentina, where it is quite a rare surname, Italy, and Brazil. Very seldom, Demarchi is the forename as well as the last name.
| giovanni antonio demarchi (1764-1850), CH (b. 1764) |
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alfredo demarchi Argentinian politician, AR (b. 1857) |
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| agostino demarchi Swiss politician (1813-1890), CH (b. 1813) |
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enrico michele demarchi Italian politician, IT (b. 1894) |
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| arturo demarchi publisher and entrepreneur, AR (b. 1861) |
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| carlo demarchi Italian association football player (1890-1972), IT (b. 1890) |
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| santiago demarchi association football player, UY (b. 1900) |
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| luigi demarchi Italian association football player, IT (b. 1910) |
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denny demarchi Canadian musician, CA (b. 1962) |
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níura demarchi Brazilian lawyer and politician, BR (b. 1963) |
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suze demarchi Australian singer, AU (b. 1964) |
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| jean-pierre demarchi French sculptor, FR (b. 1928) |
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steve demarchi Canadian musician, CA |
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| franco demarchi (b. 1921) |
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| aldo demarchi Brazilian politician, BR (b. 1944) |
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