Cognomen Demartin (Demartin 
) , all over the world, is quite a rare last name. The cognomen Demartin is characteristic of Belgium, where it is quite a rare surname, Argentina, and France, where it is a rare surname. Not in comparison with a country's population, it most frequently occurs in Argentina, the United States, and Belgium. Very seldom, Demartin is the forename as well as the last name.
| louis demartin American hostel owner (b. 1839) |
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| francesco demartin professor of General and Inorganic Chemistry and Stechiometry, Università degli Studi di Milano (University of Milan) (b. 1953) |
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| jon demartin American painter, US (b. 1955) |
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| federico demartin researcher |
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| doug demartin American footballer, US (b. 1986) |
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