Cognomen Dematteo (Dematteo 
) , across the world, is quite a rare last name. The family name Dematteo is habitual in the United States, where it is a rare surname, France, and Argentina. Measured by absolute frequency, it is commonest in the United States, France, and Italy.
| VARIANT | COUNTRY |
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| Dematteo | Italy, United States, Argentina, Canada, France |
| felice dematteo Composer, arranger, and bandmaster (b. 1866) |
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| salvatore t. dematteo New York judge and politician, US (b. 1911) |
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| carol dematteo researcher |
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| ronald p dematteo researcher |
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| karen e dematteo researcher |
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| david dematteo (b. 1972) |
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| lynda dematteo FR (b. 1974) |
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