Family name Dematteis (Dematteis 
) , all over the world, is quite a rare cognomen. The family name Dematteis is habitual in Uruguay, where it is quite a rare surname, Italy, and Argentina, where it is a rare surname. Measured by absolute frequency, the name is most common in Italy, the United States, and Argentina. Much less frequently, Dematteis is the forename as well as the last name.
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| Dematteis | Italy, Argentina, United States, France, Uruguay |
| lou dematteis American photographer, US (b. 1901) |
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j. m. dematteis comics writer, US (b. 1953) |
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| enrique dematteis Uruguayan writer, UY (b. 1935) |
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| giuseppe dematteis Italian geographer (1935-), IT (b. 1935) |
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martin dematteis Italian mountain and sky runner, IT (b. 1986) |
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bernard dematteis Italian mountain and sky runner, IT (b. 1986) |
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| bonita johnson dematteis Canadian artist and author, CA (b. 1957) |
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| massimiliano dematteis Argentinian botanist, AR (b. 1970) |
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| sylvia dematteis researcher |
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| erika michela dematteis researcher ORCID ID = 0000-0002-3680-4196 |
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| nancy dematteis Widow of Fred Dematteis and Co-Founder of The DeMatteis Family Foundation |
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| richard f. dematteis Co-principal and CEO of The DeMatteis Organization |
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| jill dematteis American statistician |
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| niccolò dematteis researcher |
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| francesca dematteis researcher |
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